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What did Alfred Wegener propose?
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What is Pangaea?
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Plate Tectonics
| Question | Answer |
|---|---|
| What did Alfred Wegener propose? | The continents were once joined together in a single landmass and drifted apart |
| What is Pangaea? | The name of the supercontinent that existed 200 million years ago |
| What evidence did Wegener use to support his theory? | Climate, Fossils, and Landforms |
| What information was Wegener missing to support his hypothesis? | The cause for the movement of the continents |
| What is the name of the long mountain chain on the sea floor? Which type of boundary does it form at? | Mid-ocean ridge; divergent |
| How did the discovery of fossils found on Africa & S.America help prove the theory of continental drift? | Africa and S. America were a apart of the same continent because the animals could not swim |
| What might Earth look like in 3 million years from now because of sea-floor spreading? | The ocean floor will continue to grow at the mid-ocean ridge |
| What is the relationship between the use of sonar and the ocean floor? | Sonar is used to map the ocean floor |
| What is the process where new ocean floor is constantly being created and recycled? | sea-floor spreading |
| What is the process where old ocean floor melts back into the mantle? | subduction |
| Where on the ocean floor does oeanic crust melt back into the mantle? | trench |
| Does the amount of land on earth increase, decrease, or remain the same? Why? | The land remains the same because subduction takes old crust back to the mantle |
| What object best represents the movement that occurs during sea-floor spreading? | A conveyer belt |
| Explain/Contrast what happens at the mid-ocean ridge versus a trench. | New rock is created at the MOR and old rock is subducted at a trench |
| Name the 3 plate boundaries. | Convergent, Divergent, Transform |
| When 2 continental plates collide, what will form? | Mountains |
| If continental crust collides with ocean crust, what will happen? Why? | Oceanic crust will sink because it is more dense. |
| Explain how a trench is formed. | Two oceanic plates collide and teh more dense oceanic crust slides under the other. |
| How else has magma affected the Atlantic ocean? | Volcanoes have been created along the plate boundaries of where the Atlantic Ocean is along the mid-ocean ridge. |
| Describe the process that creates a rift valley. | Two continental plates move apart from each other. |
| What occurs at transform boundaries? | Two plates slide past each other, moving in opposite directions resulting in earthquakes. |
| Why is the Ring of Fire known for so many volcanic eruptions and earthquakes? | The Ring of Fire is along the Pacific Ocean where there is frequent tectonic plate movement. |
| What is stress? What does it do to Earth's crust? | Stress is a force that adds energy to rock and causes the crust to break. |
| Describe the direction of each type of stress? | Tension-pulls rock apart, Compression-squeezes rock together, Shearing-pushes rock in two opposite directions |
| What type of boundary occurs where two plates collide? | Convergent |
| What process occurs when ocean crust bends downward? | Subduction |
| What type of boundary occurs where two plates move apart? | Divergent |
| Which stress force is associated with the types of faults? | Tension-Normal fault; Compression-Reverse fault, Shearing-Strike-Slip fault |
| What is a footwall and a hanging wall? | The footwall is the block of crust that is on the side of the fault UNDER. The hanging wall is the block of crust that is on the side of the fault ABOVE. |
Created by:
Y.Miller
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