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25 Cards in this Set
- Front
- Back
Who is credited with developing the continental drift hypothesis?
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Alfred Wegener
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What was probably the first evidence that led some to suspect the continents were once connected?
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Fit of the continents
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What was Pangea?
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Super continent that broke apart 200 million years ago
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List the evidence that Wegener and his supporters gathered to substantiate the continental drift hypothesis
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Fit of the continents
Fossil evidence Rock type Paleoclimatic evidence |
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Early in this century what was the prevailing view of how land animals migrate across vast expanses of ocean?
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Trans Oceanic lands bridges
Rafting Island stepping stones. |
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How did Wegner account for the existence of clays here is in the south and land masses while at the same time areas in North America Europe in Siberia support a lush tropical swaps?
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Pangea
Land masses joined together located near the south pole. |
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What are the three major types of plate boundaries?
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Convergent
Divergent Transform |
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What is seafloor spreading
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The formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges.
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Where is seafloor spreading occurring today?
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Along the oceanic ridge system.
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What is subduction? With what type of plate boundary is it associated?
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Convergent
When two oceanic slabs converge and one descends beneath the other. |
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Briefly describe how the Himalaya Mountains formed.
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Convergent boundries
50 million years ago India collided with Asia Continental crust fractured and buckled. |
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Divergent boundary
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Plates move away and
Hot mantle fills the void |
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Transform Boundary
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Plates slide horizontally passed each other
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Some predicted that California will sink into the ocean. Is this idea consistent with the theory of plate tectonics?
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Yes.
Along the San Andreas Fault, the Pacific Plate is moving toward the north west past the North American plate. If this movement continues part of California west of the fone zone will become an island. |
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Paleomagnetism
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Iron rich minerals become magnetized in the existing Magnetic field as they crystallize.
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How does the continental drift hypothesis account for the apparent wondering of Earth's magnetic poles
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A polar wandering path was constructed for North America. It revealed that North America and Europe were joined at one time.
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How do hot spots and the plate tectonics theory account for the fact that the Hawaiian Islands very in the age?
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Visible evidence of the age of the Hawaiian islands can be seen by examining its extinct volcanoes.
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Briefly describe the three mechanisms that drive plate motion
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Convection
Slab pull Ridge pull |
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Aleutian Islands
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Convergent
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Red Sea
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Divergent
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Andes Mountains
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Convergent
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San andreas fault
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Transform fault
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Iceland
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Divergent
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Japan
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Convergent
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Mt St Helens
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Convergent
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