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33 Cards in this Set
- Front
- Back
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What is Convection?
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Magma rises, cools, sinks
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What is convection responsible for?
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Movement of tectonic plates
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Where does the heat come from?
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Chemical decomposition
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What is Unifying Theory?
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Theories put together to interpret science
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What forms with convection?
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Earthquakes, volcanic eruptions, location of continents and oceans
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What are plates?
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Variable-sized pieces
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Who is Alfred Wegener?
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German who came up with the Continental Drift Hypothesis in 1912
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SECTION 2: What is subduction?
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Heavier sea plate goes under or subducts the lighter continental plate
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What is an example of subduction?
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Basalt (denser) puled under continental plate (lighter, made of granite) by gravity
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What forms due to subduction?
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Volcanic eruptions, earthquakes, and mountains
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What is an example of volcanic activity?
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Ring of Fire - pressure builds up
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What is an example of earthquakes?
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Continental plate is lighter and slides across oceanic plate
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What is an example of mountains?
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Continental and oceanic plate slides under
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What is accretion/conversion?
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Build-up of Earth's crust as sea plate slides under the continental plate
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What is an example of conversion and an example of that?
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Continent-Continent Collision (i.e. Alps)
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What are some example of DIVERGENT PLATE BOUNDARIES?
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Spreading ridges, continental rift, ocean ridge
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What is spreading ridges?
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New material erupts to fill the gap
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What is continental rift?
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Divergent boudaries form on a continent
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What is an ocean ridge?
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Divergent boundary forms under the ocean
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What is faulting?
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A crack in the Earth's crust
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Where does faulting occur and name an example of faulting?
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It occurs near boundary of a tectonic plate where plates slide past each other (San Andreas Fault, CA)
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Where else can faulting occur?
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Within the plates
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Where does faulting form?
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Under the continents during early stages or continental break-up
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What happens during faulting?
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Magma wells up= stretching, thinning, elevated
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SECTION 3: When did the New Madrid Earthquake occur?
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In the winter of 1811-1812
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How many earthquakes were there?
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There were hundreds, but the top three major ones were over 8.0 and higher.
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Where was the epicenter located at?
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New Madrid, Missouri
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How was the earthquake caused?
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Spreading of plates along the Mid-Atlantic Ridge that causes Atlantic ocean ot widen at 2" per year.
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What plate pushes the Pacific Plate?
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The North American Plate pushed westward and it moves faster which causes great pressure at the Pacific Plate, triggering an earthquake
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_______ triggered by magman under Mid-Atlantic Ridge rises through Rift Valley
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Seismic
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What were the results??
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Sidewalks cracked, bells rang in Boston, Reelfoot Lake was formed from the water flowing backwards which flooded the Bald Cyprus forest..
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What created the Reelfoot Drift?
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Millions of years ago, continent was stretched and thinned
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What is built up long New Madrid Fault?
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Pressure, in Earth's crust continues to bend and fold until one day after 100 years
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