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Chapter 4 Plate Tect
Study Guide
| Question | Answer |
|---|---|
| What is a Pangaea? | A supercontinent made of the present-day continents. |
| What evidence suggests that continents were once joined? | The puzzle-like fit of coastlines. |
| Seafloor spreading is a process that occurs where? | It occurs at mid-ocean ridges. |
| Magnetic stripes on the seafloor show what? | Earth's magnetic fields has changed. |
| What are tectonic plates? | Slabs of crust and upper mantle. |
| What happens at a transform plate boundary? | Plates slide past each other. |
| What causes tectonic plates to move? | Convection in the mantle. |
| What is located at a divergent plate boundary? | East African rift. |
| What is located at a transform plate boundary? | San Andreas Fault. |
| What is located at a convergent plate boundary? | Subduction zone |
| What force is created at divergent plate boundaries? | ridge pull |
| What force is created at convergent plate boundaries? | slab pull |
| Many of California earthquakes are caused by? | Two plates sliding past each other. |
| In a divergent plate boundary what happens? | Two plates separate |
| Wegener proposed that all the continents were once part of a super-continent called? | Pangaea |
| What provides evidence that a giant landmass existed near the equator about 250 million years ago? | glossopteris |
| This theory states that Earth's surface is made of plates that move in respect to each other. | Plate Tectonics |
| A subduction zone is located at what plate boundary? | Convergent Plate Boundary |
| Differences in the temperature of oceanic crust support What? | Seafloor spreading |
| Most mountains on Earth's continents are formed along what plate boundaries? | Convergent |
| What force will occur at a convergent plate boundary? | Slab pull |
| What is the lithosphere? | A layer of crust and solid upper-most mantle. |
| What is the Asthenosphere? | A plastic layer of rock in the mantle. |
| Ridge push is the result of what? | Rising mantle at a plate boundary. |
| What gets so hot that it behaves like a plastic material? | Asthenosphere |
| What is the place called that form new oceanic crust? | Mid-ocean ridge |
| Magnets point north when Earth's magnetic field has this? | Normal polarity |
| What takes place when Earth's magnetic field changes? | Magnetic reversal |
| Magnets points south when Earth's magnetic field does this? | Reversed polarity |
| The abyssal plain is flat due to the accumulation of what? | Sediment |
| What contributes to the high thermal-energy-flow readings near the center of a mid-ocean ridge? | Magma |
| What German scientist studied whether Earth's continents move? | Alfred Wegener |
| The hypothesis that suggests that continents are in constant motion is called? | Continental drift |
| The continents that once formed the Pangaea have coasts that fit together like pieces of a? | Puzzle |
| The topography of what includes the Abyssal plain and rugged mountains? | Seafloor |
| About how many centimeters are our continents still moving today? | About 3 centimeters per year |
| What evidence supports the continental drift? | Fossils of the same plant have been found on several different continents. |
| What happens as the seafloor spreads apart? | The older oceanic crust folds into the mid-ocean ridge. |
| Why do continents move? | Because the seafloor spreads along the mid-ocean ridge |
Created by:
bj317potter
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