| Investigating Compounds and Mixtures |
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| Investigating Ecosystems |
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| Investigating Electricity |
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| Investigating Erosion |
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| Investigating Heat |
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| Investigating Light |
New!
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| Investigating Magnets |
New!
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| Investigating Planet Earth |
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| Investigating Plants |
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| Investigating Respiration |
New!
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| Investigating Rocks |
New!
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| Investigating Solar Energy |
New!
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| Investigating Sound |
New!
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| Investigating States of Matter |
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| Investigating Water |
New!
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| Invest in the Future |
New!
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| Isabel and Her Colores Go to School |
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2.7 |
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| I See Falling Stars |
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3.4 |
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| I See Rainbows |
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3.3 |
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| I Spy with My Little Eye Baseball |
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