Oceanic crust is dominated by mafic and ultramafic intrusive igneous rocks whereas continental rocks are dominated by granitic (felsic) intrusive igneous rocks.
The difference in density has an impact on isostacy of crust floating on the semi-fluid upper mantle (asthenosphere), with continental crust (about 2.7g/cm3) rising or floating above oceanic crust (about 3.5 g/cm3).
The continental crust is by far the older of the two types of crust.
The mantle, oceanic crust, and continental crust all have different compositions due to a process called partial melting.
Because continental crust is less dense than oceanic crust it floats higher on the mantle, just like a piece of Styrofoam floats higher on water than a piece of wood does.
Answer:
Explanation:
In the layer above the troposphere, the stratosphere, temperature rises with increasing altitude. In the stratosphere, the air is heated from above by ultraviolet "light" which is absorbed by ozone molecules in the air.
Answer:
Petroleum Jelly
Explanation:
Petroleum jelly is made from the non-renewable resource, Coal. Apples are made from trees, which can be replaced, maple syrup is made from trees, and cotton is made from a plant. Coal, cannot reproduce.
Answer:
<em>The essential resources used by early peoples were:-</em>
<em> water, animals and fertile land. they needed fertile land to farm as well as water to drink and animals as a food source.</em>
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<em>Hope this help's you</em>
