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Changing Earth Adkin
Earth Layers, Continental Drift, Plate Tectonics
| Question | Answer |
|---|---|
| Earth's least dense layer | crust |
| Pressure and temperature________________ the deeper you go toward the core. | increase |
| Most dense of Earth's Layers | inner core |
| Layer responsible for Earth's magnetic field | outer core |
| Part of the mantle where convection currents take place | asthenosphere |
| Made up of the crust and upper portion of the mantle | lithosphere |
| Large slabs of lithosphere that continually move due to convection currents in the mantle | tectonic plates |
| Layer made of silicon and oxygen | crust |
| Layer that is heat source for convection currents in mantle | inner core |
| The cycle of hot magma rising and cool magma falling creates this... | convection currents |
| The Continental Drift Theory stated that continents were once joined together in a super landmass called_________________. | Pangaea |
| Scientist responsible for Continental Drift Theory | Alfred Wegener |
| Matching fossil records, matching rock layers, evidence of climate change, continent shapes were evidence for this theory | Continental Drift Theory |
| What could not be explained by Wegener? How and why the ___________________ _______________. | continents moved |
| This theory updated Wegener's theory because it explained how and why the plates moved. | Plate Tectonics Theory |
| Type of boundary where tectonic plates are moving away from each other | divergent |
| Type of boundary where tectonic plates are moving toward each other | convergent |
| Type of boundary where tectonic plates travel side by side | transform |
| Type of boundary where new crust is created | divergent |
| Type of boundary where crust is destroyed at a subduction zone as it is recycled back into the mantle | convergent |
| Type of boundary where crust is neither created or destroyed | transform |
| This type of crust is thinner, made of basalt, but more dense | oceanic |
| This type of crust is thicker, made of granite, but less dense | continental |
| Subduction zones occur at this type of plate boundary | convergent |
| Mid-ocean ridges, rift valleys, and new crust is created at this type of boundary | divergent |
| An oceanic-oceanic convergent boundary forms deep sea trenches and ______________ _______________. | island arcs |
| Volcanic islands like Hawaii are formed when tectonic plates move over a stationary mantle plume known as a __________. | hotspot |
| Geologic event that occurs at transform boundaries | earthquakes |
| A continental-continental collision at a convergent boundary will form this geologic landform... | mountains |
| The ________________ ____________ is generated by the outer core and protects us from cosmic radiation. | magnetic field |
| When Earth's magnetic poles switch from Earth's geographic poles as recorded in sea floor rock. | magnetic reversal |
| When you have oceanic-continental subduction, oceanic plates always sink under continental plates because they are more______________. | dense |
| What do we call the area where one plate (always oceanic) sinks underneath another one? | subduction |
| What is the term for the process that adds new rock to the ocean floor? | sea floor spreading |
| At what type of boundary is old crust destroyed? | convergent |
| Earthquakes, volcanoes, and _______________ all form at subduction zones | trenches |
| The Philippines, islands of Japan, and Aleutian Islands are all examples of _______________ __________. | island arcs |
| Yellowstone is an example of a ______________ under continental crust. | hotspot |
| New crust that is created is always _______________ to the center of a divergent boundary | closer |
Created by:
adkinske
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