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Unformatted text preview: These areas are where the sea floor is spreading and magma is rising to the surface to cool and form new crust. Continental areas are relatively thicker. Continents get thick due to a process called accretion, which is when continents collide and pack together to form thicker landmasses. Mountain building helps also to thicken continental areas. Most interiors of continents are billions of years old. For example the interior of North America called the Canadian shield is one of the oldest patches of land known on Earth. The shields are the blues, indigos and violets, which are the thickness pats of the lithosphere. We measure our plant with these parameters: How do we measure our planet? •Latitude •Longitude •Prime Meridian •Equator •Hemispheres •Tropics •Temperate •Polar...
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- Spring '12
- Plate Tectonics, Structure of the Earth, upper mantle, lithospheric mantle