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5 Cards in this Set
- Front
- Back
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fossils
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hardened remains of an animal or plant that lived long ago (pg. 42)
The rocks I found had some fossils in them. |
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hardened
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became solid
(pg. 42) The melted wax soon cooled and hardened. |
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scientists
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people who study things in nature
(pg. 44) Some scientists, people who study things in a careful way, dig for fossils. |
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difficult
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not easy
(pg. 48) The puzzle was difficult to do. |
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extinct
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no longer living
(pg. 51) Some kinds of animals and plants used to live on Earth, but now are extinct. |
