Which of the following statements best describes the composition of rocks?

a. rocks always consist of a single type of mineral.
b. rocks can only be made up of a combination of three types of mineral.
c. rocks are made up of one or more types of mineral.
d. rocks are made up of at least three different types of mineral.

answer:

the corret answer is: c

explanation:

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.

i just learnt this recently but i need to look through my notes again