life & earth history Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
Continental Drift | hypothesis stating that continents slowly drift parallel to Earth's surface |
Uniformitarianism | the idea that Earth's processes are at work today were also working on Earth in the past |
Superposition | the theory that undisturbed layers rock have the oldest on the bottom and the youngest on the top |
Sedimentary Rock | rock that is broken down into smaller pieces or that is dissolved in water |
Pangaea | ancient super continent that began breaking up about 200 million years ago |
Plate Tectonics | theory that explains how lithospheric plates move and interact, causing major geologic features and events |
Fossil Record | the history of all known fossils and their placements in the formation of rocks and positions in time |
Absolute Dating | calculated by using half-life of certain isotopes |
Estimation | an approximate calculation of quantity |
Radioactive Decay | when an unstable atomic nucleus changes another nucleus by emitting particle and energy |
Igneous Rock | rock that forms from magma or lava |
Relative Dating | age based on objects found at the same site |
Half-life | the time it takes a given amount of a radioactive isotope to decay to half its original mass |
Atoms | the smallest unit of matter, a nucleus surrounded by protons and electrons |
Index Fossils | the fossilized remains of an organism that existed over vast areas for a short period time |
Created by:
200410974
Popular Science sets