<span>This
is due to changes in atmospheric chemistry. This is as a result of both natural
and human activities such as industrial emission of gases in one location than
the other or even the quantity of greenhouse gases emitted in the atmosphere.
This may cause differences in average yearly temperature for different
locations. Also, natural changes in the sun which affect the amount of incoming
solar radiation may also be responsible for these differences.</span>
The basaltic rock that forms volcanic mountains where the mantle plumes reach the Earth's surface is usually composed of fine-grained, dark-colored felsic materials. Basalt is a hard, black rock which is formed when magma or lava from volcanic eruptions cools down and hardens. It consists of fine mineral grains. It can also consist of holes that were filled by volcanic gases. Basalt is black because the minerals that it is made up of contains iron. Iron gives basalt its black colour.
Basalt is not a type of sedimentary rock
