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plate tectonics
lesson
| Question | Answer |
|---|---|
| The theory of _________ __________________ states that Earth's surface is divided into large plates of rock. | plate tectonics |
| Each plate moves over Earth's ________________ and changes position with respect to other plates. | mantle |
| What happens when plates separate on the seafloor? | mid-ocean ridges form |
| What happens when one plate dives under another plate? | earthquakes can result and volcanoes can form |
| Earthquakes can also result when plates do what past another? | slide |
| What is the Earth's largest tectonic plate? | Pacific plate |
| What is the cold, rigid rock layer on the outermost part of Earth called? | lithosphere |
| What does the lithosphere consist of? | crust and the upper part of the mantle |
| What is below the lithosphere? | asthenosphere |
| What is the asthenosphere like | very hot that is flows like plastic |
| What happens to the plates of the lithosphere? | They move because they rest on the flowing asthenosphere. |
| What is the place where two plates meet called? | boundary |
| What is the boundary called when two plates move away from each other? | divergent boundary |
| In the ocean, _____ _______ _________ are located at divergent plate boundaries. | mid ocean ridges |
| If divergent plate boundaries separate parts of a continent, what forms? | rifts |
| When two plates slide by each other, what forms? | transform boundary |
| What happens when this type of movement happens? | fault and earthquakes form |
| What form when two plates collide? | convergent |
| What is the process when plates collide, and the plate that is denser slides under the less-dense plate? | SUBDUCTION |
| What is a trench? | these form when oceanic plates slide under a continental plate |
| What forms near a trench? | a line of volcanoes |
| When two oceanic plates collide what forms? | a trench and an island arc |
| When do mountains form? | These form when two continental plates collide, neither plate is subducted. |
| What do scientists now use to measure how continents move? | GPS and satellites |
| What explains why earthquakes and volcanoes occur in certain locations? | theory of plate tectonics |
| Earth's mantle moves because warmer, less-dense materials rise and cooler, denser materials ___________________________. | sink |
| What is convection? | materials move during this process based on differences in their temperatures and densities |
| What provides some of the thermal energy that causes convection inside the Earth? | radioactive elements |
| Convection currents form in the mantle when thermal energy transfers from the __________________________ to the mantle. | core |
| How many forces interact to cause tectonic plate motion? | 3 |
| What is basal drag? | This is when convection currents in the mantle produce a force that causes motion. |
| What is ridge push? | This is when plates are pushed away from each other at mid-ocean ridges by a force. |
| What is slab pull? | This is when a plate sinks below another plate, it pulls on the rest of the plate and exerts a force. |
| Plate tectonics is the unifying theory of ________________________________. | Geology |
| Plate tectonics theory is still being ______________________ as scientists learn more about how Earth's tectonic plate move. | revised |
Created by:
jacksterner