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Tectonics
7th Grade Unit 17
| Term | Definition |
|---|---|
| Pangaea | a supercontinent that existed millions of years ago, made up of all the continents on Earth |
| Tectonic Plates | large, solid slabs of rock that move slowly across the Earth's surface |
| Convection Currents | a circular movement of fluid (like air or molten rock) caused by differences in temperature, where warmer, less dense material rises and cooler, denser material sinks, creating a continuous cycle of movement |
| Divergent Boundary | a place where two tectonic plates move apart, creating a gap that can be filled with magma |
| Convergent Boundary | a place where two tectonic plates move towards each other and collide |
| Transform Boundary | a place where two tectonic plates slide past each other horizontally |
| Continental Crust | the relatively thick part of the earth's crust that forms the large landmasses |
| Oceanic Crust | the outermost layer of Earth's lithosphere that's found under the oceans. It's made of dense, dark-colored rocks like basalt and gabbro |
| Subduction Zones | a region where two tectonic plates meet and one plate is forced beneath the other |
| Seafloor Spreading | a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other |
| Mid-Ocean Ridges | a chain of underwater volcanoes that runs along the ocean floor, created by tectonic plates moving apart |
| Ocean Basin (trench) | a large, bowl-shaped depression in the Earth's surface that is filled with salt water and separated from the continents |
Created by:
klstorie
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