Credits and Acknowledgements: Photography:

Images – Science

• 2 boys working on machine, © Paul A. Souders/Corbis
  (Grade 1/Unit 3)
• A falling water droplet, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Grade 1/ Unit 2)
• Acorn, © Dreamstime
  (Grade 2/Unit 9)
• Adult sheep. © Ingram Publishing/PictureQuest/Jupiterimages
  (Grade 1/Unit 1)
• Adult sheep. © Ingram Publishing/PictureQuest/Jupiterimages
  (Grade 2/Unit 10)
• Alexander Hamilton Custom House. © Lee Snider/Photo Images/Corbis
  (Grade 2/Unit 7)
  
• Alley in downtown Seattle. © Mike Bacon/BigStockPhoto.com
  (Grade 2/Unit 5)
• Alligator. © Photodisc
  (Grade 1/Unit 1)
• Amethyst.© Photodisc/Getty Images
  (Grade 2/Unit 7)
  
• Andalusite. Courtesy of Stan Celestian/Glendale Community College
  (Grade 2/Unit 7)
• Ant. © iStockphoto
  (Grade 1/Unit 6)
• Ant hill. © iStockphoto
  (Grade 1/Unit 6)
• Antarctica ice cliff. © Digital Vision/Getty Images
  (Grade 1/Unit 6)
• Apatite. © Dorling Kindersley
  (Grade 2/Unit 7)
  
• Astronaut, © Oxford Scientific Films
  (Kindergarten/Unit 15)
• Autumn leaves, © 2001 Corbis Corporation. All rights reserved.
  (Kindergarten/Unit 10)
• Baby. © Jupiterimages
  (Grade 2/Unit 10)
• Baby. © Photodisc
  (Grade 2/Unit 10)
• Baby lamb running. © M. Botzek/zefa/Corbis
  (Grade 1/Unit 1)
• Baby lamb running. © M. Botzek/zefa/Corbis
  (Grade 2/Unit 10)
• Ball in pool, © Photodisc
  (Grade 1/Unit 2)
• Balloons, © Photodisc
  (Grade 1/Unit 2)
• Barite. © Mark A. Schneider/Visuals Unlimited
  (Grade 2/Unit 7)
• Basilica Santa Maria, Rome. © Roberto Marinello/Dreamstime.com
  (Grade 2/Unit 7)
• Basketball, © Eye Wire
  (Grade 2/Unit 5)
• Basketball player streching, Copyright, © 1998-2001 EyeWire, Inc. All rights reserved.
  (Grade 1/Unit 9)
• Beakers with metric measuments on them, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Grade 1/Unit 1)
• Bear catching fish at river, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Grade 1/Unit 5)
• Bee.© IT Stock Free
  (Kindergarten/Unit 1)
• Bee.© IT Stock Free
  (Grade 2/Unit 5)
• Birds at their nest, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Kindergarten/Unit 6)
• Blackberries. © iStockphoto
  (Grade 2/Unit 9)
• Book, © Jupiterimages
  (Grade 1/Unit 2)
• Box turtle. © Big Stock Photo
  (Kindergarten/Unit 5)
• Boy, © Jupiterimages
  (Grade 1/Unit 2)
• Boy acting like a scientist. © Corbis Stock Market
  (Grade 1/Unit 1)
• Boy eating ice cream. © Creatas/Jupiterimages.
  (Kindergarten/Unit 1)
  
• Boy looking at collected clips on magnet, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Kindergarten/Unit 14)
• Boy on slide. © Dreamstime
  (Grade 2/Unit 3)
• Boy pulling red wagon. © Chris Lowe/Index Stock Imagery.
  (Kindergarten/Unit 14)
• Boy pulling red wagon. © Chris Lowe/Index Stock Imagery
  (Grade 2/Unit 2)
  
• Boy recycling, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Kindergarten/Unit 12)
• Boy smelling the flower with his mom, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Kindergarten/Unit 1)
• Boy with a big truck, © 2001 Corbis Corporation. All rights reserved.
  (Kindergarten/Unit 7)
• Brown tarantula. © AbleStock/Index Stock Imagery
  (Grade 1/Unit 4)
• Brown tarantula. © AbleStock/Index Stock Imagery
  (Grade 2/Unit 10)
  
• Brussels sprouts. © PhotoObjects.net.
  (Kindergarten/Unit 1)
• Bucket of popcorn. © Artville.
  (Kindergarten/Unit 1)
• Bubbles. © Jupiterimages
  (Grade 1/Unit 2)
• Butterfly. © Artville
  (Grade 1/Unit 1)   
• Burdock, © iStockphoto
  (Grade 2/Unit 9)
• Calcite. © Mark A. Schneider/Photo Researchers, Inc.
  (Grade 2/Unit 7)
• Calcite. © Mark A. Schneider/Photo Researchers, Inc.
  (Grade 2/Unit 7)
• Calm ocean. © Photodisc
  (Grade 1/Unit 7)
• Camels in the desert, UAE. © Sean Randall/iStockphoto.com
  (Grade 2/Unit 8)
• Candle wax. © iStockphoto.com
  (Grade 1/Unit 8)
• Cardinal. © Photodisc.
  (Kindergarten/Unit 1)
• Cardinal. © Photodisc
  (Grade 2/Unit 5)
• Caterpillar, © iStockphoto
  (Grade 2/Unit 10)
• Cecil John Rhodes on the slopes of Table Mountain. © Don Bayley/iStockphoto.com
  (Grade 2/Unit 7)
• Celestite. © Mark A. Schneider/Visuals Unlimited
  (Grade 2/Unit 7)
• Chameleon on plant by the river, © Gallo Images/CORBIS
  (Kindergarten/Unit 3)
• Child. © Jupiterimages
  (Grade 1/Unit 8)
• Child at computer, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Grade 2/Unit 1)
• Children holding hands in a circle, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Grade 1/Unit 2)
• Child with apple. © Fotoila
  (Grade 2/Unit 5)
• Chipmunk. © Photodisc
  (Kindergarten/Unit 1)
• Chipmunk. © Photodisc
  (Grade 2/Unit 5)
• The Citadel, Scotland/Dreamstime
  (Grade 2/Unit 7)
• Clock. © iStockphoto
  (Grade 2/Unit 3)
• Cloud, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Kindergarten/Unit 9)
• Coastline. © Jupiterimages
  (Grade 1/Unit 7)
• Compass, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Grade 1/Unit 4)
• Cookies. © Jupiterimages
  (Grade 1/Unit 2)
• Cornfield. Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Kindergarten/Unit 13)
• Corundum.© ephotocorp/Alamy
  (Grade 2/Unit 7)
• Coral reef. © Photodisc
  (Grade 1/Unit 7)
• Coral reef diver. © Photodisc
  (Grade 1/Unit 7)
• Corn snake, © Jupiterimages
  (Grade 2/Unit 10)
• Corn snake eggs. © Jupiterimages
  (Grade 2/Unit 10)
• Custom House, Dublin. © Joe Burns/iStockphoto.com
  (Grade 2/Unit 7)
• Cutting bread. © Jupiterimages
  (Grade 2/Unit 3)
• Dandelion. © iStockphoto
  (Grade 2/Unit 9)
• Deer. © Photodisc
  (Grade 1/Unit 6)
• Desert. © Jupiterimages
  (Grade 1/Unit 6)
• Diamond. © Thomas Hunn Co./Visuals Unlimited
  (Grade 2/Unit 7)
• Doorstop. © iStockphoto
  (Grade 2/Unit 3)
• Dry cockleburs. © iStockphoto
  (Grade 2/Unit 9)
• Duck. © Photodisc
  (Grade 1/Unit 6)
• Earth. NASA
  (Grade 1/Unit 7)
• Earth, © Oxford Scientific Films
  (Kindergarten/Unit 11)
• Eastern tiger swallowtail caterpillar. © Bob Wilson/Visuals Unlimited
  (Grade 2/Unit 10)
  
• Empty classroom. © AbleStock/Index Stock Imagery
  (Grade 2/Unit 5)
• Empty movie theater. © Corbis Royalty-Free/PictureQuest
  (Grade 2/Unit 5)
• Energetic kids. © Big Stock Photo
  (Grade 2/Unit 10)
• Epidote. © Mark A. Schneider/Visuals Unlimited
  (Grade 2/Unit 7)
• Erosion, © Dreamstime
  (Grade 2/Unit 10)
• Erosion. © Gallo Images/Corbis
  (Grade 1/Unit 8)
• Family. © Photodisc
  (Grade 2/Unit 10)
• Fawn in field of daisies. © Royalty-Free/Corbis
  (Grade 1/Unit 1)
• Fawn in field of daisies. © Corbis Royalty-Free
  (Grade 2/Unit 10)
  
• Fluorite.© K12 Inc.
  (Grade 2/Unit 7)
• Fluorite. © K12 Inc.
  (Grade 2/Unit 7)
  
• Flying ant. © Artville
  (Grade 1/Unit 4)
• Forest. © Photodisc
  (Grade 1/Unit 6)
• Fossil. © Fotoila
  (Grade 2/Unit 10)
• Fossil, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Grade 1/Unit 7)
• Friedrick Mohs. © IMAGNO/Austrian Archives
  (Grade 2/Unit 7)
• Friends conducting an experiment, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Grade 2/Unit 1)
• Frog. © Index Open
  (Grade 2/Unit 10)
• Frog. © IT Stock Free
  (Kindergarten/Unit 1)
• Frog. © IT Stock Free
  (Grade 2/Unit 5)
• Frog. © Photodisc
  (Grade 1/Unit 1)
• Frog. © iStockphoto
  (Grade 2/Unit 10)
• Frog eating an insect (What do animals need - photo 4), © Joe McDonald/Corbis
  (Kindergarten/Unit 3)
• Gal Viharya, Sri Lanka. © Sheldan Collins/Corbis
  (Grade 2/Unit 7)
• Girl. © Photodisc
  (Grade 2/Unit 10)
• Girl eating ice cream cone, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Grade 1/Unit 2)
• Girl listening to a seashell, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Grade 1/Unit 5)
• Girl on bike. © Dreamstime
  (Grade 2/Unit 3)
• Girl tasting lemon. © Geri Engberg/The Image Works
  (Kindergarten/Unit 1)
• Glass vase, © Kip Peticolas, Fundamental Photography
  (Grade 1/Unit 8)
• Gold. © Ken Lucas/Visuals Unlimited
  (Grade 2/Unit 7)
• Goldfish. © Index Open
  (Grade 1/Unit 1)
• Granite Buddha, Namsan, So. Korea. © Martin Moos/Lonely Planet Images
  (Grade 2/Unit 7)
• Granite Iselburgs, Kangaroo Island, South Australia. © Zbindere/iStockphoto.com
  (Grade 2/Unit 7)
  
• Grasshopper.© IT Stock Free
  (Kindergarten/Unit 1)
• Grasshopper. © DeniceBreaux/iStockphoto.com
  (Grade 1/Unit 4)
• Grasshopper. © DeniceBreaux/iStockphoto.com
  (Grade 2/Unit 10)
• Grasshopper. © Peter Wey/iStockphoto.com
  (Grade 1/Unit 4)
• Grasshopper. © Peter Wey/iStockphoto.com
  (Grade 2/Unit 10)
  
• Grasshopper.© IT Stock Free
  (Grade 2/Unit 5)
• Grasslands, © iStockphoto
  (Grade 1/Unit 6)
• Great horned owl. © Index Stock Imagery/PictureQuest/Jupiterimages
  (Grade 1/Unit 1)
• Great horned owl. © Index Stock Imagery/PictureQuest/Jupiterimages
  (Grade 2/Unit 10)
• Great Horned Owlets, © iStockphoto
  (Grade 2/Unit 10)
• Great horned owlets. © Lynda Richardson/Corbis
  (Grade 1/Unit 1)
• Great horned owlets. © Lynda Richardson/Corbis
  (Grade 2/Unit 10)
• Great Horned Owl, © Jupiterimages
  (Grade 2/Unit 10)
• Great Pyramid, Giza. © AbleStock/Index Stock Imagery
  (Grade 2/Unit 7)
• Group of monkeys, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Kindergarten/Unit 5)
• Gulf fritillary butterfly emerging (5 photos). © John P. Marechal/Bruce Coleman, Inc.
  (Grade 2/Unit 10)
  
• Halite. © José Manuel Sanchis Calvete/Corbis
  (Grade 2/Unit 7)
• Hematite. © ephotocorp/Alamy
  (Grade 2/Unit 7)
• Hickory horned devil caterpillar. © Leroy Simon/Visuals Unlimited
  (Grade 2/Unit 10)
  
• Holstein calf. © T. Allofs/zefa/Corbis
  (Grade 1/Unit 1)
• Holstein calf. © T. Allofs/zefa/Corbis
  (Grade 2/Unit 10)
  
• Holstein cow. © Keith Levit Photography/Index Stock Imagery
  (Grade 1/Unit 1)
• Holstein cow. © Keith Levit Photography/Index Stock Imagery
  (Grade 2/Unit 10)
  
• Horse pulling carriage © AbleStock/Index Stock Imagery
  (Kindergarten/Unit 14)
• Horse pulling carriage © AbleStock/Index Stock Imagery
  (Grade 2/Unit 2)
• Ice cube. © Punchstock/Getty Images
  (Grade 1/Unit 2)
• Insect eating a leaf (What do animals need - photo 5), Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Kindergarten/Unit 3)
• Iron sulfide-pyrite.© John Lens/Alamy
  (Grade 2/Unit 7)
• Jellyfish, NOAA
  (Grade 1/Unit 7)
• Kangaroo. © Photodisc
  (Grade 1/Unit 1)
• Kelp. © Dreamstime
  (Grade 1/Unit 7)
• Kicking a soccer ball, © Reflections Photolibrary/Corbis
  (Grade 1/Unit 2)
• Kids sitting with their hands and feet shown, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Kindergarten/Unit 2)
• Korean push game.© WizData, Inc./Alamy
  (Kindergarten/Unit 14)
• Korean push game.© WizData, Inc./Alamy
  (Grade 2/Unit 2)
• Labradorite. © Vaughan Fleming/Photo Researchers, Inc.
  (Grade 2/Unit 7)
  
• Ladybug. © Serdar Yagci/iStockphoto.com
  (Grade 1/Unit 4)
• Ladybug. © Serdar Yagci/iStockphoto.com
  (Grade 2/Unit 10)
  
• Large magnet on a crane lifting up a car, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Grade 2/Unit 4)
• Leopard frog. © iStockphoto
  (Kindergarten/Unit 5)
• Liquid Mercury, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Grade 1/Unit 2)
• Lizard. © iStockphoto
  (Grade 1/Unit 6)
• Lizard skin. © Jupiterimages
  (Kindergarten/Unit 5)
• Macaw. © Jupiterimages
  (Grade 1/Unit 6)
• Magnet. © Yoav Levy/Alamy
  (Grade 2/Unit 4)
• Magnifying glass. © iStockphoto
  (Grade 2/Unit 10)
• Mallard duck. © Getty Images
  (Grade 2/Unit 10)  
• Mallard duck eggs. © iStockphoto
  (Grade 2/Unit 10)
• Mallard duckling. © iStockphoto
  (Grade 2/Unit 10)
• Man pulling hot air balloon. © FogStock LLC/Index Stock Imagery
  (Kindergarten/Unit 14)
• Man pulling hot air balloon. © FogStock LLC/Index Stock Imagery
  (Grade 2/Unit 2)
• Maple seed. © Dreamstime
  (Grade 2/Unit 9)
• Mars, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Grade 2/Unit 1)
• Melbourne/City Lights reflecting on harbor, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Grade 1/Unit 8)
• Metamorphic rock. © Dreamstime
  (Grade 2/Unit 10)
• Milford Sound with Mitre Peak, New Zealand. © Erik van den Elsen/iStockphoto.com
  (Grade 2/Unit 8)
• Milkweed seed. © iStockphoto
  (Grade 2/Unit 9)
• Mineral. © Fotoila
  (Grade 2/Unit 10)
• Mohs hardness scale. © Dorling Kindersley
  (Grade 2/Unit 7)
• Mom. © Jupiterimages
  (Grade 2/Unit 10)
• Monarch Butterfly, Danaus plexippus, emergance of an adult, Tatlem Bend, Australia (first), © Audie Kuiter/Oxford Scientific Films
  (Grade 1/Unit 10)
• Monarch Butterfly, Danaus plexippus, emergance of an adult, Tatlem Bend, Australia (second), © Audie Kuiter/Oxford Scientific Films
  (Grade 1/Unit 10)
• Monarch Butterfly, Danaus plexippus, emergance of an adult, Tatlem Bend, Australia (third), © Audie Kuiter/Oxford Scientific Films
  (Grade 1/Unit 10)
• Monarch Butterfly, Danaus plexippus, emergance of an adult, Tatlem Bend, Australia (fourth), © Audie Kuiter/Oxford Scientific Films
  (Grade 1/Unit 10)
• Monarch Butterfly. © iStockphoto
  (Grade 2/Unit 10)
• Monarch butterfly. © Lowell Gordon/iStockphoto.com
  (Grade 2/Unit 10)
• Monarch butterfly metamorphosis (5 photos). © John P. Marechal/Bruce Coleman, Inc.
  (Grade 2/Unit 10)
  
• Monarch caterpillar on a milkweed leaf. © Al Braunworth/iStockphoto.com
  (Grade 2/Unit 10)
• Monarch chrysalis. © Robin Arnold/iStockphoto.com
  (Grade 2/Unit 10)
• Monarch eating milkweed. © Dwight Kuhn
  (Grade 2/Unit 10)
• Monkey. © Photodisc
  (Grade 1/Unit 1)
• Mount Rushmore. © Photodisc/PunchStock
  (Grade 2/Unit 7)
• Mourning cloak larva. © George D. Lepp/Corbis
  (Grade 2/Unit 10)
  
• Mud flats, Thingvellir NP, Iceland.© Corbis Royalty-Free
  (Grade 2/Unit 8)
• Muskrat. © Big Stock Photo
  (Grade 1/Unit 6)
• Ngee Ann City, Singapore. © photocritic.org/Alamy
  (Grade 2/Unit 7)
• Northern lights. © iStockphoto
  (Grade 1/Unit 8)
• Ocean Liner, © Pat O'Hara/Corbis
  (Grade 1/Unit 1)
• Ocean swimmer. © Jupiterimages  
  (Grade 1/Unit 7)
• Ocean waves. © Photodisc 
  (Grade 1/Unit 7)
• Open ocean. © Photodisc  
  (Grade 1/Unit 7)
• Orange juice. © Jupiterimages 
  (Grade 1/Unit 2)
• Osaka Castle Garden. © Nic Cleave Photography/Alamy
  (Grade 2/Unit 7)
• Owl. © Photodisc
  (Grade 1/Unit 1)
• Painted lady butterfly eggs on leaf. © Carolina Biological Supply Company/Phototake
  (Grade 2/Unit 10)
• Painted lady caterpillar. © Patti Murray/Animals Animals
  (Grade 2/Unit 10)
  
• Pillbug. © Wayne Stadler/iStockphoto.com
  (Grade 1/Unit 4)
• Pillbug. © Wayne Stadler/iStockphoto.com
  (Grade 2/Unit 10)
  
• Pitcher of water. © Eyewire
  (Grade 1/Unit 2)
• Plants, © Jupiterimages
  (Grade 2/Unit 10)
• Plants, © Oxford Scientific Films
  (Grade 1/Unit 9)
• Plow pushing snow.© FogStock LLC/Index Stock Imagery
  (Kindergarten/Unit 14)
• Plow pushing snow.© FogStock LLC/Index Stock Imagery
  (Grade 2/Unit 2)
• Polar bear, © Jupiterimages
  (Grade 1/Unit 6)
• Pond. © Keith Levit Photography/Index Stock Imagery
  (Grade 1/Unit 6)
  
• Polar bear family, © Dan Guravich/Corbis
  (Grade 1/Unit 6)
• Rabbit fur, © Dreamstime
  (Kindergarten/Unit 5)
• Rainy day in the city, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Grade 1/Unit 3)
• Rain forest, © Punchstock/Getty Images
  (Grade 1/Unit 6)
• Red and white blood cells, © Oxford Scientific Films
  (Grade 1/Unit 6)
• Red-legged frog. © Digital Vision/Getty Images, Inc.
  (Grade 1/Unit 1)
• Red-legged frog. © Digital Vision/Getty Images, Inc.
  (Grade 2/Unit 10)
• Red rooster, © iStockphoto
  (Kindergarten/Unit 5)
  
• Red Sea Reef, © Oxford Scientific Films
  (Grade 1/Unit 7)
• Reflection in mirror, © Jupiterimages
  (Grade 1/Unit 8)
• Rhodochrosite. © Mark A. Schneider/Visuals Unlimited
  (Grade 2/Unit 7)
  
• Robin with a worm in its mouth (What do animals need - photo 3), © Roger Tidman/Corbis
  (Kindergarten/Unit 3)
• Rock weathering, © Dreamstime
  (Grade 2/Unit 10)
• Rocks, © Fotoila
  (Grade 2/Unit 10)
• Rope and pulley, © Fotoila
  (Grade 2/Unit 3)
• Salmon, © Big Stock Photo
  (Grade 2/Unit 10)
• Salmon egg, © iStockphoto
  (Grade 2/Unit 10)
• Salt pans in Sacred Valley. © Jakob Leitner/iStockphoto.com
  (Grade 2/Unit 8)
• Screw, © Dreamstime
  (Grade 2/Unit 3)
• Scientists conducting experiment in lab, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Grade 2/Unit 1)
• Scissors, © Jupiterimages
  (Grade 2/Unit 3)
• Seesaw, © Fotoila
  (Grade 2/Unit 3)
• Slide, © Dreamstime
  (Grade 2/Unit 5)
• Snake, © Photodisc
  (Grade 1/Unit 1)
• Snow leopard cub. © Oxford Scientific/PictureQuest/Jupiterimages
  (Grade 1/Unit 1)
• Snow leopard cub. © Oxford Scientific/PictureQuest/Jupiterimages
  (Grade 2/Unit 10)
  
• Snow leopard walking on ice. © Creatas Images/PictureQuest/Jupiterimages
  (Grade 1/Unit 1)
• Snow leopard walking on ice. © Creatas Images/PictureQuest/Jupiterimages
  (Grade 2/Unit 10)
• Soap bubbles, © Jupiterimages
  (Grade 1/Unit 2)
• Soil, © Fotoila
  (Grade 2/Unit 10)
• Soil. © Lisa Thornberg/iStockphoto.com
  (Grade 1/Unit 6)
• Spider, © Photodisc
  (Grade 1/Unit 1)
• Stapler, © Jupiterimages
  (Grade 2/Unit 3)
• Sulfur. © Larry Stepanowicz/Visuals Unlimited
  (Grade 2/Unit 7)
• Sulfur. © Larry Stepanowicz/Visuals Unlimited
  (Grade 2/Unit 7)
• Sunflower close-up, © Alain Christof/Oxford Scientific Films
  (Kindergarten/Unit 4)
• Sun ray, © David Buffington/Corbis  
  (Grade 1/Unit 8)
• Sunflowers, © Jupiterimages
  (Grade 2/Unit 10)
• Supreme Court, Washington, D.C. © Gary Blakeley/iStockphoto.com
  (Grade 2/Unit 7)
• Tadpole, © Big Stock Photo
  (Grade 2/Unit 10)
• Tadpole. © Oxford Scientific/PictureQuest/Jupiterimages
  (Grade 1/Unit 1)
• Tadpole. © Oxford Scientific/PictureQuest/Jupiterimages
  (Grade 2/Unit 10)
• Talc. © Ben Johnson/Photo Researchers, Inc.
  (Grade 2/Unit 7)
• Talc. © Ben Johnson/Photo Researchers, Inc.
  (Grade 2/Unit 7)
• Teenager, © Photodisc 
  (Grade 2/Unit 10)
• Terrarium with millipedes.© K12 Inc.
  (Grade 1/Unit 4)
• Terrarium with millipedes.© K12 Inc.
  (Grade 2/Unit 10)
• Themometer, © Photodisc
  (Grade 2/Unit 5)
• Tiger, © Jupiterimages
  (Grade 2/Unit 10)
• Tiger cubs, © Jupiterimages
  (Grade 2/Unit 10)
• Tobacco hornworm caterpillar. © Dr. William J. Weber/Visuals Unlimited
  (Grade 2/Unit 10)
  
• Toddler pushing go-kart. © Chris Rogers/Index Stock Imagery
  (Kindergarten/Unit 14)
• Toddler pushing go-kart. © Chris Rogers/Index Stock Imagery
  (Grade 2/Unit 2)
• Tower Bridge, London, © AbleStock/Index Stock Imagery
  (Grade 2/Unit 7)
  
• Toy tow truck pulling toy car. © photolibrary/Index Stock Imagery
  (Kindergarten/Unit 14)
• Toy tow truck pulling toy car. © photolibrary/Index Stock Imagery
  (Grade 2/Unit 2)
  
• Tractor pushing ice.© Ralph Reinhold/Index Stock Imagery
  (Kindergarten/Unit 14)
• Tractor pushing ice.© Ralph Reinhold/Index Stock Imagery
  (Grade 2/Unit 2)
  
• Tree, © Ian West/Oxford Scientific Films
  (Grade 1/Unit 10)
• Turtle, © Photodisc
  (Grade 1/Unit 1)
• Violin, © iStockphoto
  (Grade 2/Unit 5)
• Wagon. © Photodisc
  (Grade 1/Unit 2)
• Water & ice, Copyright © 1998-2001 EyeWire, Inc. All rights reserved.
  (Kindergarten/Unit 8)
• Water bottle, © Index Open
  (Grade 1/Unit 2)
• Wax paper, © K12 Inc.
  (Grade 1/Unit 8)
• Well-preserved wetlands near Parris Island, South Carolina. © Stan Conti/iStockphoto.com
  (Grade 2/Unit 5)
• Wetlands, © Big Stock Photo
  (Grade 1/Unit 6)
• Whale, © 123RF
  (Grade 1/Unit 1)
• Whitetail deer with antlers. © Gary W. Carter/Corbis
  (Grade 1/Unit 1)
• Whitetail deer with antlers. © Gary W. Carter/Corbis
  (Grade 2/Unit 10)
  
• Woman pushing stroller. © PhotoObjects.net
  (Kindergarten/Unit 14)
• Woman pushing stroller. © Photo Objects.net
  (Grade 2/Unit 2)
  
• Worm. © IT Stock Free
  (Grade 1/Unit 6)
• Wright Brothers Monument, North Carolina. © Peter Reid/BigStockPhoto.com
  (Grade 2/Unit 7)
  
• Wulfenite. © Mark Gibson/Visuals Unlimited
  (Grade 2/Unit 7)
• Yellow highlighter, © Artville 
  (Grade 2/Unit 5)
• Zebra, © Jupiterimages
  (Grade 1/Unit 6)
• Zebras, Digital Imagery, © copyright 2001 PhotoDisc, Inc.
  (Grade 1/Unit 4)