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Continental Drift
Gr.7 science
Term | Definition |
---|---|
Asthenosphere | The layer of Earth below the Lithosphere. The asthenosphere contains hot, partially melted with plasticlike properties |
Lithosphere | The solid, rocky layer of Earth including the crust and top part of the mantle. |
Volcano | An opening in Earth's crust through which hot gases, rock fragments, and molten rock erupt. |
Dome Mountain | A mountain formed then magma lifts Earth's surface, creating a broad dome, or bulge. |
Fault-block Mountain | A mountain formed when masses of rock move up or down along a fault. |
Folded Mountain | A mountain formed when two tectonic plates collide. |
Divergent Boundaries | A place where the plates that make up Earth's crust and upper mantle move away from one another. |
Convergent Boundaries | A place where the plates that make up the Earth's crust and upper mantle move together. |
Transform-fault Boundaries | A place where the plates that make up Earth's crust and upper mantle move past one another. |
Convection | The process by which heat energy is transferred through liquids or gases by the movement of particles. |
Convection Currents | The path along which energy is transferred during convection. Scientists think that convections currents in the mantle causes Earth's tectonic plates to move. |
Theory of Plate Tectonics | The theory that Earth's lithosphere is broken into enormous slabs, or plates, that are in motion. |
Plate Boundaries | A place where the plate that make up Earth's crust and upper mantle either move past one another. |
Crust | The thin outer layer of Earth |
Mantle | The middle layer if Earth. |
Pangaea | A supercontinent that existed about 200 million years ago |
Theory of Continental Drift | A theory that states the continents formed a single land mass at one time in the past and have drifted over time to their present positions, suggested by Alfred Wegener |