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5 Cards in this Set

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fossils
hardened remains of an animal or plant that lived long ago (pg. 42)

The rocks I found had some fossils in them.
hardened
became solid
(pg. 42)
The melted wax soon cooled and hardened.
scientists
people who study things in nature
(pg. 44)
Some scientists, people who study things in a careful way, dig for fossils.
difficult
not easy
(pg. 48)

The puzzle was difficult to do.
extinct
no longer living
(pg. 51)
Some kinds of animals and plants used to live on Earth, but now are extinct.