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Plate Tectonics
6th grade Plate Tectonics
| Question | Answer |
|---|---|
| Holes drilled several kilometers into Earth's crust provide direct evidence about Earth's interior in the form of what? | rock samples |
| Geologists obtain indirect evidence about Earth's interior by what? | recording and studying seismic waves |
| What is the correct order (starting from the surface) of Earth's layers? | crust, mantle, outer core, inner core |
| Earth's inner core is _______? | a dense ball of solid metal |
| Heat transfer within a fluid takes place by what? | convection currents |
| According to Wegener's hypothesis of continental drift, _____________________. | the continents were once joined together in a single landmass |
| What is Pangaea? | The name of the supercontinent that existed millions of years ago |
| Which type of evidence was NOT used Alfred Wegener to support his continental drift hypothesis? | evidence from human remains |
| Why did most geologists reject Alfred Wegener's idea of continental drift? | Wegener could not identify a force that could move the continents |
| In sea-floor spreading, molten material rises from the mantle and erupts where? | along mid-ocean ridges |
| How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it? | by determining the age of rock samples obtained by drilling on the sea floor |
| What did scientists notice when they observed the mid-ocean ridge? | pillow-shaped rocks formed by the rapid hardening of molten material |
| The process in which the ocean floor sinks beneath a deep-ocean trench and back into the mantle is known as what? | subduction |
| Most geologists think that the movement of Earth's plates is caused by what? | convection currents in the mantle |
| The geological theory of ________________ states that pieces of Earth's lithosphere are in constant, slow motion. | plate tectonics |
| What is a place where two plates slip past each other, moving in opposite directions? | transform boundary |
| Where does a rift valley form? | divergent plate boundary |
| Using data from seismic waves, geologists have learned that Earth's interior is made up of several what? | layers |
| Earth's magnetic field is a result movements in the ____________. | outer core |
| Scientists think that convection currents flow in Earth's _________________. | mantle |
| A collision between two pieces of continental crust at a converging boundary produces a _________________. | mountain range |
| The place where two plates come together is known as a ___________________. | convergent boundary |
| What forms when continental plates pull apart at a divergent boundary on land? | rift valley |
| What part of the mantle is made of soft rock that bends like plastic? | asthenosphere |
| In the mantle, heat is transferred as soft rock flows slowly in circles is known as what? | convection currents |
| What process continually adds new crust to the ocean floor along both sides of the mid-ocean ridge? | sea floor spreading |
| Subduction occurs where the oceanic crust bends down toward the mantle at a _____________. | deep ocean trench |
| The lithosphere is broken into sections called _______________ that float on top of the atmosphere. | plates |
| What is the process in which the ocean floor sinks beneath a deep-ocean trench and back into the mantle? | subduction |
| What is made of liquid iron and nickel and moves to produce Earth's magnetic field? | outer core |
Created by:
Pacelli
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