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plate boundaries
| question | Answer |
|---|---|
| continental drift | it is a theory that the continents drifted apart |
| sea floor spreading | Harry Hess discovered that magma was rising on the sea floor causing it to spread. It also made tectonic plates move from magma coming to the surface. |
| convection currents | transfers energy in the mantle. causes the hotter magma to rise . also causes the cooler magma in the mantle in sink. |
| divergent boundaries | 2 continental crusts diverge and create a rift valley in Africa. New crust is created over millions of years water will eventually fill the valley. |
| transform boundaries | plates that slip sideways past each other creating earthquakes . Mostly found at the sea floor |
| normal fault | caused by tension )divergent) |
| reverse fault | caused by compression (convergent) |
| strike slip fault | caused by shearing (transform) |
| converging boundaries | two oceanic crusts collide and push against each other. the older and denser crust does below the other. This creates volcanic arc islands |
| ring of fire | a long chain of volcanoes that surround the Pacific ocean. One of the most active volcanic eruptions sites. |
Created by:
chloewalerius
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