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20 Cards in this Set
- Front
- Back
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Who is Alfred Wagener?
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A scientist who propsed the Theory of Continental Drift.
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What was his speech in 1912 about?
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presented evidence that the continents were at one time a coninuous land mass and that all the continents might once have been joined.But have drifted apart.
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What is the evidence to support this theory?
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1. Continental shelves fit together like a puzzle. 2.Fossil remains of certain species of plants and animals were found on separate continents. 3.Climate of many parts of the world has changed over time.
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Define Continental shelf.
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An underwater part of a continent that extends under shallow water from the edge of land down to a steeper slope.
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Define Pangaea.
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A super continent. "All land"
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Define Theory of Continental Drift.
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the continents were once on landmass that had broken apart and moved to their present positions.
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Define Theory of Plate Tectoncis.
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The Earth's crust and upper mantle are broken into enormous slabs called plates.
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Define Tectonic Plates
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Another name for the slabs that make up Earth's crust and upper mantle.
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Define mantle.
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the layer of Earth between
the crust and the core. middle layer of Earth. |
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Define Crust.
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the Earth's outer most layer.
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Define plate boundaries.
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A place where the plates that make up Earth's crust and upper mantle either move together or apart or past one another
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How do the plates interact?
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1. They can come together.
2. move apart 3. slide past one another. |
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Identify the seven major tectonic plates.
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North American Plate.
South American Plate African Plate, Eruasian Plate, Indo-Arutralian Plate, Antarctic Plate, Pacific Plate. |
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What does SONAR stand for? What is it used for?
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SONAR= Sound Navigation And Ranging.
It is used to map the ocean floor. |
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Define magnetic field.
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Area around a magent where the effects of magnetism are felt. The force of the magnet is felt in this space.
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Define magnetic reversal.
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the switching or changing of Earth's magnetic pole such that the north magnetic pole becomes located at the south magnetic pole's position and vice versa.
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Define sea floor spreading.
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the process by which new ocean floor is continually being formedas magma rises to the surface and hardens into rock.
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Define mid-ocean ridge.
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a chain of mountains under the ocean.
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How are earthquakes, volcanoes, and tectonic plates connected?
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Earthquakes and volcanoes often occur at plate boundaries. Tectonic plates have their boundaries here also. (remember the Earth rockin' and Rollin'!)
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Why have scientists found evidence of glaciers in warm places such as Africa?
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Theory of Continental Drift. The land was once one big land mass but have moved apart.
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