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Layers of the Earth and Tectonics (Layers of the Earth (Mantle, molten…
Layers of the Earth and Tectonics
Destructive Plate Boundaries
A destructive plate boundary happens where an oceanic and continental plate move towards each other. The heavier, more dense oceanic plate is forced under the continental plate. The crust becomes molten called magma. This may be forced to the surface of the earth causing a volcanic eruption.
The movement of the oceanic plate is not smooth. Due to friction the plate gets stuck. Pressure then builds up. The plate will eventually slip sometimes causing an earthquake.
Destructive plate margins occur where an oceanic and continental plate move towards each other. The Pacific Plate and Eurasian Plate and the Nazca Plate and the South American Plate.
Constructive Plate boundaries
A constructive plate boundary, sometimes called a divergent plate margin, occurs when plates move apart. Volcanoes are formed as magma wells up to fill the gap, and eventually new crust is formed.
An example of a constructive plate boundary is the mid-Atlantic Ridge.
Conservative Plate Boundaries
At this type of plate boundary, the plate boundary slides past each other and build up frictional energy. When the pressure is released, it sends huge amounts of energy out, causing earthquakes.
Layers of the Earth
Mantle, molten rock that can move due to it being super heated, making up 84% of the Earths volume.
Oceanic Crust, denser and thinner
Inner Core, 6000 miles below, Molten Iron and Nickle
Outer core, molten Iron and Nickle
Continental Crust, older, less dense and thicker
all tectonic plates
