The asthenosphere is made up of mafic and ultramafic rocks. It has the same material as the upper lithosphere, but the material in the asthenosphere is in a plastic, viscous state and moves around much more readily than the material in the lithosphere.Know More
Mafic rocks are rocks that are made from silicates or ferromagnesian minerals. These minerals include pyroxene, olivine and amphibole. The rocks they produce include volcanic rocks like basalt, breccia, gabbro and diabase.
Ultramafic rocks are simply rocks that are very high in mafic minerals and low in silicates. These types of rocks include peridotite, lamproite and kimberlite, from which diamonds are mined.
The asthenosphere is a low, weak zone in the earth's upper mantle. The temperatures in the asthenosphere are high, though lower than they are in the inner core of the planet. However, the pressure is considerably lower. This is what allows the materials in the asthenosphere to exist in a plastic state and allows the lithosphere to float on top of it. This happens even though the materials in the lithosphere are relatively rigid.
The asthenosphere is about 62 miles thick and doesn't have well-defined upper or lower boundaries. Its boundaries depend on the state of the earth's mantle overall.Learn more about Atmosphere
Convection currents flow in the asthenosphere, immediately below the rocky outer lithosphere. Convection currents are one of three types of heat transfer, which involve the movement of energy from a warmer object to a cooler object.Full Answer >
Air is made mostly out of nitrogen, oxygen and argon that are kept in proportion to each other. Interestingly, the gas that's most abundant in air isn't oxygen but nitrogen. Air is made up of about 78 percent nitrogen, and oxygen makes up about 21 percent of air.Full Answer >
The troposphere is made up largely of nitrogen and oxygen with trace amounts of argon, carbon dioxide and hydrogen ozone. The troposphere also contains the majority of the water vapor in the atmosphere.Full Answer >
Between 0 and 4 percent of the Earth's atmosphere is made up of water vapor. The amount of water vapor present in the atmosphere, also known as humidity, is the most variable characteristic of the atmosphere and is largely dependent on air temperature.Full Answer >