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study stake ch. 7
Question | Answer |
---|---|
Continental drift | when lithospheric plates move |
uniformitarianism | states that Earth's process that are at work today were at work in the past |
superposition | states that the layers of rocks are stacked oldest on the bottom and young on top |
sedimentary rock | rock formed from sediment |
Pangea | ancient theory of super continent that began breaking up 200 million years ago |
Plate tectonics | theory that explains how lithospheric plates move and interact causing major geologic features |
fossil record | information about what an oranisim looks like, where it lives and how it envolved |
absolute dating | calculated by using half-time of certain isotopes |
estimation | an approximate calculation of a quantity |
radioactive decay | when an unstable atomic nucleus changes to another nucleus by emitting practice |
igneous rocks | magma that has been solid |
relative dating | age based on subject found at the same site |
half-life | time it take a give amount of a radioactive isotope to decay half it's original mass |
atoms | the building blocks of all matter |
index fossil | fossilized remains of a organism that existed over vast area for a short period of time |