The fossil fuel deposits we use today are the remains of ...

[nenivikky]

The fossil fuel deposits we use today are the remains of organisms from which period in Earth's history?
 
  A) The Cretaceous Period
  B) The Carboniferous Period
  C) The Cambrian Period
  D) The Archaean Eon

Question 2

What is the difference between center of gravity (cg) and center of mass (cm)? When are they the same?
 
  What will be an ideal response?

[leeeep]

Answer to Question 1

B

Answer to Question 2

The cm is at the average position of the masses and does not depend upon gravity. The cg is the average position of weights with each mass being weighted by the strength of gravity g. The cm and the cg are identical when g is the same for all the masses.

[nenivikky]

TY

[leeeep]

You're welcome