Answer:
It could technically be either. The majority of coal deposits
appear to be biotic, though there are some geochemists who believe
that abiotic coal deposits might exist deep in the crust.
Answer:
What do you mean by sphere
Explanation:
Answer:

Explanation:
Given

See attachment
Required
Find 
To do this, we make use of the following theorem
--- angle at the center and angle between two tangents add up to 180 (i.e. they are supplementary angles)
So, we have:

Collect like terms


Answer:It's False
There are four other bodies in our solar system that is volcanic activity.They are:
1. Earth
2.A moon of Jupiter
3.Triton,a moon from Neptune
4.Enceladus,a moon from Saturn
Hope this helps :)
Black Bush Poulder is not one of Guyana's sugar estate.
Happy Studying! ^=^