Layers of the Earth
Terms in this set (11)
the thin, rocky layer on the surface of the earth.
composed mostly of granite and sedimentary rock
much lighter and thicker than the oceanic crust.
Less dense than oceanic crust.
sits up higher than oceanic crust.
composed mostly of basalt and sediments.
sits lower than continental crust.
thinner than continental crust.
Mohorovicic (Moho) Discontinuity (boundary)
a boundary in the earth's crust and the rest of the interior
earthquake waves are deflected at this boundary; they do not pass directly through the earth
separates the crust from the mantle
the layer immediately below the Moho
divided into 2 sections: upper and lower mantle
Upper mantle is composed of rocks even more dense than rocks of the oceanic crust
Lower mantle: made of similar rocks, but due to great pressure, the rocks are even denser
A boundary 2900 km below the earth's surface that separates the outer core from the mantle
liquid layer of the core that contains iron; Believed to be responsible for creating the magnetic fields of the earth
Solid part of the core that is composed of iron and nickel. Extreme pressure due to the weight of overlying rocks probably keeps the core solid
Consistency is solid; composed of the crust and upper manlte, floats on the asthenosphere
100 km thick layer near the top of the mantle. High temperature and pressure combine to cause a small amount of melting of the rocks. Makes asthenosphere a little softer than the rest of the mantle.
the transfer of heat by the circulation or movement of solids, liquids, or gases