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g7 3.3
7th Grade STEMscopes CA Segment 3 Scope 3
Question | Answer |
---|---|
Continental Drift | The theory that continents were once connected but have drifted apart |
Crust | The thin, solid, outermost layer of Earth; is either continental (landmasses) or oceanic (ocean floors) |
Fossils | The mineralized remains of organisms, showing how long-dead organisms lived and how their bodies were structured |
Index Fossils | Fossils that are widespread, come from organisms that lived over a relatively short period of time, and can be used to correlate rock strata |
Mantle | The solid layer of Earth between the crust and the core; made of dense silicates |
Plate Tectonics | The theory that the crust is divided into large pieces called tectonic plates that slowly move on top of the mantle |
Tectonic Plate | Huge piece of crust that slowly moves on the upper, ductile part of the mantle |