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
An urban heat island is an elevation in the temperature of outdoor urban air during the daytime. This is a result of man-made structures, such as buildings and roads, that have replaced outdoor vegetation, such as trees. As a result, more heat is absorbed, and the temperature is warmer.Full Answer >
The Earth's atmosphere is composed of several layers of gases that reach altitudes up to 6,200 miles above sea level. The lowest layer of the atmosphere is known as the troposphere, which reaches altitudes up to 11 miles.Full Answer >
To calculate dew point, you need to know the current temperature and relative humidity, and then solve the equation Td = T - ((100 - RH) / 5) for Td, which stands for the dew point temperature in degrees Celsius. This equation is accurate for humidity values above 50 percent.Full Answer >
The thickest layer of the atmosphere is the troposphere, which averages 11 miles high at the equator and is thinner at the poles. All the weather occurs in this layer, and the troposphere contains nearly 80 percent of the air in the Earth's atmosphere. Above the troposphere, in ascending order, is the stratosphere, mesosphere, thermosphere and exosphere.Full Answer >