Convection<span> is </span>heat transfer<span> by mass motion of a fluid such as air or water when the </span>heated<span> fluid is caused to move away from the source of </span>heat<span>, carrying energy with it. </span>
Answer:
I believe the answer is

Explanation:
I may be incorrect because I used to do this a long time ago but I believe I am correct
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The Mantle lies underneath the crust.
Answer:
Due to the chemical versatility of carbon atoms
Explanation:
Carbon is a very important element and it is commonly found in many varieties of chemical compounds. They are also found to be present in space in various amount. It is often considered to be versatile because they are capable of forming single, double, as well as triple bonds. This enables them to make single and branched chains. They also form ring chains when combined with other atoms of carbon.
It is because of this versatility of carbon atoms, there forms complex variety of organic molecules.