Schist
Option 2.
<u>Explanation:</u>
Schist is a type of a metamorphic rock but it is a medium grade of these metamorphic rocks. It is formed by the metamorphosis of the mud stone or the shale.
These type of metamorphic rocks can also be formed from igneous rocks provided these have been subjected to higher degrees of temperature or pressure. These are type of rocks which do not solidify from magma even despite subjection to intense heat and pressure.
The most important measure of the choices is (c)volume of the discharge
The answer is b constant and unique
When a volcano erupts without any indication.
Answer:
The natural gas is used more often because it is much more environmentally friendly.
Explanation:
Most of the world, in order to produce energy for whatever purpose, mostly relies on usage of fossil fuels. The fossil fuels that are the most dominant when it comes to usage are unfortunatelly the ones that cause the most pollution. Those two fossil fuels are the coal and oil. There is another fossil fuels though that has always been in the background but is gradually becoming more and more popular.
The fossil fuel that starts to gain more ground is the natural gas. The natural gas is relatively abundant, easy for usage, transportation, and economically justifiable. What is also very important and gives it an advantage lately is the fact that the pollution form it is uncompearably lower, in fact, the methane that is released from the natural gas only does so because of leaks during its transportation.
