Most of Earth is made of
Rock is
changing.

melted

Explanation:

drásticas changing

1: Rock

2:Constantly

Explanation:

most of earth is made of ROCK rock is CONSTANTLY changing

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225