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Plate Tectonics
Chapter 3 Plate tectonics
| Question | Answer |
|---|---|
| Explain continental drift | Continental drift is the idea that the continents slowly moved over Earth's surface |
| What is Pangea? | Pangea is a single landmass (super continent) that once existed 300 million years ago |
| What was Wegener's Hypothesis about the continents? | Wegener's hypothesis was that all the continents were once joined to ether in a single landmass and have since drifted apart. |
| List evidence that Pangea once existed | Fossils found on numerous continents, mountain ranges lined up, climate change |
| What are mid-ocean ridges? | Mid-ocean ridges form long chains of mountains that rise from the sea floor |
| Explain sea-floor spreading. | mid-ocean ridges continually add new material to the ocean floor. More crust is added to the ocean floor while older strips of rock move outward from either side of the ridges |
| List the evidence for sea floor spreading | Evidence from ocean material, magnetic strips, and drilling samples. |
| What is a deep ocean trench | It is a huge underwater canyon. |
| Explain subduction. | when the ocean floor sinks beneath a deep-ocean trench and back into the mantle again |
| What is the theory of plate tectonics? | The theory of plate tectonics states that Earth's plates are in slow, constant motion, driven by convection currents in the mantle. |
| What is a divergent boundary? | when two plates move apart |
| What is a convergent boundary? | when two plates come together |
| What is a transform boundary? | when plates slide past each other |
| Scientists think the continents once formed a large single landmass that broke part and the continents slowly drifted to their present locations. What is the name given to this hypothesis? | continental drift |
| Which theory explains why the island of Cuba moves a few centimeters each year? | plate tectonics |
| Fossils of the same reptile are found in South America and Africa. These fossils indicate that the same reptile lived on both continents at the same time. How does the theory of plate tectonics explain this observation? | The theory states that both continents were once part of a single larger continent. |
| Earthquakes that occur on land are caused by which of the following? | Earth’s plates shifting and colliding against each other |
| Earthquakes typically occur _____. | along plate boundaries |
| The movement of the tectonic plates is due to _____. | convection currents |
| Where do convection currents happen inside Earth? | In the mantle |
Created by:
jwilke1
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