Which statement about gravity is true?
a. it depends on other forces like frictiont to work.
b. it is described as a fundamental force and therefore does not depend on other forces.
c. it depends on velocity.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

option number c is the right answer.