False or true: The upper and lower mantle are made out of Iron and nickel.
(I believe It is I'm just making sure Ima keep firing these questions btw)

Nuclear experimentation is a major global issue that affects relationships between countries. describe why countries try to limit the testing of nuclear weapons.

Heyi am new to are you all americans? ( just want to know , i don't mean any offence ) ?

Zac wanted to determine the measure of r and of ? r in the triangle below. to fine the measure of r, zac sets up the problem.42^2 + 24^2 = r 2. determine whether zac set the problem up correctly.