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another little fun thing for continental drift.

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Continental Drift: Alfred Wegener Song by The Amoeba People

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┏━━━━━━━━┓  6.5 Theory of  plate tectonics

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┏━━━━━━━━┓  6.5 Theory of  plate tectonics

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The plate tectonics theory brings together continental drift and seafloor spreading. The theory explains most of the features of Earth's surface. It explains why earthquakes, volcanoes, and mountains are the way they are. It also explains where to find mineral resources. Explains why:
•Earth’s geography has changed over time and continues to change today.

• some places are prone to earthquakes while others are not.

• certain regions may have deadly, mild, or no volcanic eruptions.

• mountain ranges are located where they are.

• many ore deposits are located where they are.

• living and fossil species of plants and animals are found where they are.

• some continental margins have a lot of geological activity, and some have none.

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Tectonic plate move only 5 centimeters per year (about the same as our fingernails). The plates moving are caused by convection (rising and sinking of hot and cool material in the mantle). The plates would move horizontally away from mid-ocean crest then cool and sink back down into the mantle at deep sea trench. SO, seafloor spreading takes place as plates move apart at mid-ocean ridge.

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Scroll down to see diagram and rest of information

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6.3 Earth's Tectonic            Plates
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The plates that are part of earth are slabs of Earth's lithosphere that move on the surface. The portions were discovered during the Cold War (Vietnam War). Much like how the observation of seafloor spreading was proven during World War 2.
The lithospheric plates are made of the oceanic and continental crust. (they can just be one, or both). Lithospheric plates can also rise and sink in the mantle.

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┏━━━━━━━━━┓   6.2 Seafloor         Spreading       Hypothesis 

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┏━━━━━━━━━┓   6.2 Seafloor         Spreading       Hypothesis 

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Seafloor spreading observation has concluded that the continents have moved. Some observations are that the sea has a large mountain range, the magnetic polarity changes, and the youngest seafloor is at the ridge.

Seafloor spreading is caused by hot magma rising into rift valleys at mis-ocean ridges then cools to form seafloor. Also, moving crust pushes continents away from ridge axis

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Sea Floor Spreading & Plate Tectonic Evidence

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Continental drift was first hypothesized by Alfred Wegener, a german researcher. He set out to find evidence that the continents were once all together and one bug land mass. His evidence included:

Fit of the continents

Distribution of fossils

Distribution of rocks and structures

Climate zones

Glaciers

Tropics

PANGEA IS THE SUPERCONTINENT