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22 Cards in this Set
- Front
- Back
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At one time, the earth was comprised of one gigantic land mass called....
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Pangaea
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The continents are plates of the earth's ___ floating on a plasticky layer called the _____
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crust
asthenosphere |
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Plates that move away from each other are said to be ....
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diverging
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Plates that move toward each other are said to be ....
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converging
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In the middle of the Atlantic Ocean is the Mid-Atlantic Ridge which is a ___ zone and site of ____ spreading.
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rift
seafloor |
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A rift zone or spreading center is a place of....
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divergence
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A place where two plates collide is called a ....
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subduction zone or place of convergence
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A place where two plates slide past each other but not toward nor away is a...
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transform fault
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India forming the Himalyan Mtns. is caused by ....
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convergence
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Lake Tanganyika in Africa is very deep. It is a place of ....
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divergence (a rift zone that will someday be a new ocean)
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Hawaii is an "intraplate" phenomenon. It is a ___ ___ of volcanic action sitting in the middle of a Pacific Plate.
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hot spot
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As the Pacific Plate moves over the Hawaiian volcano what happens?
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New islands form, with the newest and biggest one being to the east and the oldest one to the west.
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Convergent and divergent areas are noted by the presence of ___ & ____
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earthquakes
volcanoes |
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The Pacific Ocean is surrounded by volcanoes and earthquakes. We call this the....
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Ring of Fire
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Strong evidence for seafloor spreading comes from both sides of the Mid-Atlantic Rift. What is it?
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Reversals of the polarity of the material in the sediment as the seafloor was established. It's put down in symmetrical stripes on either side of the rift.
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What type of zone is this?
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subduction zone or
Convergent Plate Boundary |
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What kind of zone is this?
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seafloor spreading
Divergent Zone |
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When did the Appalachian Mountains form?
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When North America was still touching (and pressing into) Africa, which caused the folding of the land that created the mountains.
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Where is new ocean crust formed?
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At divergent seafloor spreading centers
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Where are deep ocean trenches likely to be found?
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At subduction zones (convergences)
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One famous very deep trench is the....
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Mariana trench
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Why are volcanoes found inland of convergence centers?
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The friction & pressure of the plates sliding past each other, deep down, causes earth to melt and form magma
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