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Grier EOG Review 15
Chapter 15 Vocabulary
Question | Answer |
---|---|
Person who studies past life | paleontologist |
dating an object by its position in rock layers | relative dating |
younger rocks lie over older rocks | superposition |
a layer of missing rocks(moved by erosion) | unconformity |
time it takes for half a radioactive sample to decay | half-life |
footprints of a dinosaur | trace fossil |
cavity in a rock left by a shell | mold |
remains of past life | fossil |
"Age of Reptiles" | mesozic era |
"Age of Mammals" | cenozoic era |
"Ancient Life" | paleozoic era |