Fossils

paleontology

the study of fossils

petrification

the process in which an animal or plant turns to stone

preserve

to protect something so that it stays in its original state

tar pit

a pool of black, sticky asphalt

amber

a sticky sap from ancient pine trees that has hardened

cast

a fossil that forms when sand, mud, or minerals harden inside a mold

sedimentary rock

a rock that forms when layers of rock get stuck together

extinct

when all animals or plants of a certain type die and none are left

fossil

any evidence or remains of ancient plants and animals

imprint

an impression left by a thin object in sand or mud that hardens into roc