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Earth's Interior
Earth's Interior, Seafloor spreading, plate movement
| Question | Answer |
|---|---|
| Thinnest layer of the Earth | Crust |
| Continental crust is _____________________ than oceanic crust | thicker and less dense |
| Oceanic crust is _____________________ than continental crust | thinner and more dense |
| Oceanic crust is mainly this type of crust. | Basalt |
| Continental crust is mainly this type of crust. | Granite |
| The oldest oceanic crust is __________ years old. | 180 million |
| Scientists used to think the ocean floor was ________. | Flat |
| The newest oceanic rock is at the ____________________. | mid-ocean ridge |
| The oldest oceanic rock is at the _______________. | trenches |
| What forms trenches? | subducting plates |
| Why does oceanic crust subduct if pushed against continental crust? | It is more dense |
| What are the three types of plate boundaries? | convergent, divergent, and transform |
| What did scientists use to examine the shape of the ocean floor? | sonar |
| In the ocean, where is sediment the thickest? | far from the mid-ocean ridge |
| In the ocean, where is sediment the thinnest? | at the mid-ocean ridge |
| Why is sediment the thinnest at the mid-ocean ridge? | Rock hasn't had time to weather yet. |
| Which layer of the earth is responsible for the magnetic field? | Outer core |
| What is responsible for magma rising in some places within the Earth? | it is less dense |
| What is the term for rising and falling magma within the earth? | convection currents |
| In which layer of the Earth do convection currents take place? | mantle |
| Who first publicized the idea of continental drift? | Alfred Wegener |
| Why did people not believe Wegener's idea of continental drift? | He couldn't explain how it happens |
| What is some evidence that Wegener used to support his idea of continental drift? | same fossils on different continents, same rock types on different continents, shapes of the continents |
| Which type of boundary is responsible for the biggest earthquakes? | transform |
| Which types of plates converge to make the biggest mountain ranges? | continental and continental |
| Which types of plates converge to make subduction zones? | continental and oceanic |
| Coal beds in Antarctica indicate that that continent _______________ | used to be closer to the equator |
| What landform is found at converging continental-continental plates | Large mountain ranges |
| Converging boundaries form | deep-sea trenches, island arc volcanoes, and continental mountains |
| The Hawaiian Islands activity showed us how scientists find what two pieces of information about plate movement? | Direction they move and speed that they move |
| The theory of ______________ explains how new ocean crust is created at mid-ocean ridges and destroyed at deep-sea trenches. | Seafloor spreading |
| Crust is neither created or destroyed along which type of boundary? | transform |
| A change in Earth's magnetic field is called ___________. | Magnetic reversal |
| ____________ occurs when one tectonic plate descends below another one. | Subduction zone |
| Why at converging oceanic and continental plates is it the oceanic plate that subducts? | the oceanic plate is more dense |
| Why are the worlds largest mountains formed at converging continental plates? | both continental plates are lower densities and try to ride up over the other plate |
| Why are mountains formed at converging continental plates not volcanic? | there is little to no subduction |
| Why are volcanoes often found at converging boundaries where there is subduction? | The subducting plate melts, making it less dense as it gets hotter and the newly melted rock rises up through the lithosphere |
| What is the lithosphere? | The hard rocky portion of the earth at the surface. |
Created by:
jfjohnson