HELLO GUYS Who want's to hang out

Which layer surrounds the center of the earth? a: crust b: core c: mantle

The first atomic explosion was detonated in the desert north of alamogordo, new mexico, on july 16, 1945. what percentage of the strontium-90 ( yr) originally produced by that explosion still remains as of july 16, 2016?

Which of the following scenarios is an example of a trade sanction