Plate tectonics is a claim by Wegener that the Earth's continents fit together like puzzle pieces. He did not live to see his theory accepted.
Acceptable evidence includes fossil connections, radioactive dating, and seafloor spreading.
Seafloor spreading was discovered as a by-product of World War II. On either side of a sea floor spread is a symmetrical rock band made of basalt. In this band, we can see that on a somewhat regular basis, the north and south pole change places.
There are three main rock types: sedimentary, igneous, and metamorphic.
Rocks are made of minerals
Fossils are a living thing that turns into rock over time by being covered with sediment and water. This means that fossils are found in sedimentary rock.
Igneous rock is found mainly as a result of volcanoes. Obsidian and basalt are common igneous rocks.
A visual picture of this event:
The earth will probably not end in 2012.
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1 comment:
the video really helps you to understand what sea floor spreading is and what it does.
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