Air
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Amazing Plant Bodies: Tiny to Gigantic
4.1
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American Alligator
4.1
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Arapaima
4.1
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Arctic Fox
3.7
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Armadillo's Burrow
4.0
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Badger's Burrow
4.3
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Baking and Crushing: A Look at Metamorphic Rock
4.6
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Bark Scorpion
4.1
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Becoming an Astronaut
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Black Caiman
4.4
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Bobcat
4.0
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Building with Poop
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Bull Shark
4.4
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Burrowing Owl's Hideaway
3.9
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California Sea Lion
3.7
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Camel
3.9
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Chipmunk's Hole
3.8
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Collared Lemming
4.2
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Collared Lizard
4.0
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Color
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Cooking with Sunshine: How Plants Make Food
4.0
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Cottonmouth
4.1
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Covered in Water
3.9
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Creeping Slime: Slime Molds
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Desert Tortoise's Burrow
4.1
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Dirt
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Dirt or Soil--What's the Difference?
3.9
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Dirty Air
4.3
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Electric Eel
4.4
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Extreme Trees: And How They Got That Way
4.2
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Famous Rocks
4.3
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Flying Lemur
3.8
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Fog, Mist, or Haze?
4.0
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Fox's Den
3.8
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Freaky Plant Facts: Extreme Greens
3.9
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From Bird Poop to Wind: How Seeds Get Around
4.1
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Garbage Galore
4.5
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Giant Otter
3.9
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Gila Monster's Burrow
4.3
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Global Warming
4.4
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Great White Shark
4.0
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Green Anaconda
4.3
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3.8
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Green Slimers: Opossums
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Green Tree Python
3.6
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Groundhog's Burrow
3.7
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Harp Seal
3.7
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Harpy Eagle
4.3
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Healing Plants: Medicine from Nature
4.7
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Heat
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How Are Rain, Snow, and Hail Alike?
3.7
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How Do Animals Help Make Soil?
4.1
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How Do People Use Rocks?
4.4
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How Do Volcanoes Make Rock?: A Look at Igneous Rock
4.3
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How Do Water and Wind Change Rock?: A Look at Sedimentary Rock
4.2
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How Do You Know It's Fall?
3.7
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3.6
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3.6
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3.4
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How Plants Clean the Air: One Leaf at a Time
4.2
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Inside the Ants' Nest
3.8
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Inside the Bees' Hive
3.6
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Inside the Cricket's Burrow
4.2
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Inside the Spider's Web
4.1
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4.0
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Inside the Worm's Hole
3.8
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Investigating Asteroids
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Is All Soil the Same?
4.1
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Is Sand a Rock?
3.9
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Jaguar
4.0
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Kangaroo Rat's Burrow
3.6
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Koala
3.8
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Light
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Liquids and Solids
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Living on Mars
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Looking for Another Earth
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Magnets
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Meat-eating Plants: Toothless Wonders
4.3
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Meerkat's Burrow
4.0
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Moray Eel
3.9
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Motion
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Muskrat
4.1
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North American River Otter
3.9
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Plants
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Poison Petals: Don't Eat!
4.3
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Poison Slimers: Poison Dart Frogs, Sea Cucumbers & More
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Poisoned Rivers and Lakes
4.4
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Polar Bear
3.8
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Polluted Oceans
4.4
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Poop Cures
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Poop Power
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Poop's Many Uses
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Prairie Dog's Hideaway
3.9
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Prickly Plants: Stuck!
4.2
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Reindeer
3.8
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Roadrunner
3.9
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Rocks and Minerals
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Roseate Spoonbill
4.0
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Saltwater Crocodile
4.0
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Say Hello to H2O
4.2
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Sea Otter
3.8
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Sidewinder
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Snowshoe Hare
3.8
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Sound
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Spotted Owl
3.7
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Surviving in Space
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The Water Beneath Your Feet
4.4
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Tree Kangaroo
3.7
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Water
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Water Plants: All Wet!
4.1
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Weather
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Wet, Blue, and Good for You
4.2
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What Are Clouds?
3.9
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What Are Rocks Made Of?
4.2
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What Is Climate?
4.1
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4.0
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What Is the Rock Cycle?
4.7
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What Is the Water Cycle?
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What Is Weather?
4.1
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What Lily Gets from Bee: And Other Pollination Facts
4.3
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What's So Fresh About Fresh Water?
3.9
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What's Soil Made Of?
4.0
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Why Do Most Plants Need Soil?
3.9
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Why is Seawater Salty?
3.9
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Wombat's Burrow
3.9
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Wood Duck
3.6
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Woodpecker
3.8
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Working in Space
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