Continental Drift and Clues found on the seafloor

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17 Terms

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Pangaea

large, ancient landmass that was composed of all the continents joined together

<p>large, ancient landmass that was composed of all the continents joined together</p>
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Continental Drift Theory

the idea that continents slowly shift their positions due to movement of the tectonic plates on which they ride

<p>the idea that continents slowly shift their positions due to movement of the tectonic plates on which they ride</p>
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Alfred Wegener

A German scientist who proposed the theroy of continental drift

<p>A German scientist who proposed the theroy of continental drift</p>
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buoyancy

the ability or tendency to float in water or air or some other fluid.

<p>the ability or tendency to float in water or air or some other fluid.</p>
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Glossopteris fossils

these were plants that resembled ferns found on different continents. They lived about 250 million years ago. Their seeds have traveled across the ocean.

<p>these were plants that resembled ferns found on different continents. They lived about 250 million years ago. Their seeds have traveled across the ocean.</p>
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Climate clues of continental drift

-glacial striations found on rocks indicated glaciers existed in areas that now were not located in an area on Earth cold enough to support the glaciers

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Mesosaurus and Lystrosaurus

Wegener inferred that these ancient reptiles once lived on a single landmass that has since split apart

<p>Wegener inferred that these ancient reptiles once lived on a single landmass that has since split apart</p>
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Rock Correlation

The matching of rock layers from one area to another

<p>The matching of rock layers from one area to another</p>
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mid-ocean ridge

An underwater mountain chain where new ocean floor is formed

<p>An underwater mountain chain where new ocean floor is formed</p>
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magnetic reversal

a switch in the direction of Earth's magnetic field so that the magnetic north pole becomes the magnetic south pole and the magnetic south pole becomes the magnetic north pole.

<p>a switch in the direction of Earth's magnetic field so that the magnetic north pole becomes the magnetic south pole and the magnetic south pole becomes the magnetic north pole.</p>
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Age of seafloor rocks

Progressively younger toward the mid-oceanic ridge

<p>Progressively younger toward the mid-oceanic ridge</p>
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rift valley

A deep valley that forms where two plates move apart

<p>A deep valley that forms where two plates move apart</p>
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continental shelf

A gently sloping, shallow area of the ocean floor that extends outward from the edge of a continent

<p>A gently sloping, shallow area of the ocean floor that extends outward from the edge of a continent</p>
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Plate Tectonics

A theory stating that the earth's surface is broken into plates that move.

<p>A theory stating that the earth's surface is broken into plates that move.</p>
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abyssal plain

a large, flat, almost level area of the deep-ocean basin

<p>a large, flat, almost level area of the deep-ocean basin</p>
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island

a piece of land surrounded by water

<p>a piece of land surrounded by water</p>
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Seamount

an underwater mountain rising above the ocean floor

<p>an underwater mountain rising above the ocean floor</p>