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Mod 1 plate tectonis
| Term | Definition |
|---|---|
| plate tectonics | the idea that Earth’s crust is broken into big pieces (plates) that slowly move |
| Pangea | a supercontinent that existed millions of years ago when all the continents were joined together |
| convection currents | the circular, upward movement of hot rock in the mantle that pushes the plates around |
| magma | hot, melted rock under Earth’s surface |
| lava | magma that comes out of a volcano onto Earth’s surface |
| subduction zone | a place where an oceanic plate slides under a continental plate |
| seafloor spreading | when new ocean floor is made as plates pull apart and magma comes up |
| plate boundary | location where plates are moving and interacting with each other |
| convergent boundary | a plate boundary where two plates are moving towards each other |
| divergent boundary | a plate boundary where two plates are moving away from one another |
| transform fault boundary | a plate boundary where two plates are sliding past one another |
| volcano | mountain that forms when melted rock (lava) comes out and hardens |
| Pacific Ring of Fire | an area around the Pacific Ocean where many earthquakes and volcanoes occur |
| earthquake | the sudden shaking of the ground when energy is released along a crack in Earth’s crust |
| seismic wave | energy waves that move through the ground during an earthquake |
| fault | a crack in Earth’s crust |
Created by:
eziennkerlee