Which example provides scientific data about the earth's interior?
a. earth's orbit around the sun
b. the size of volcanoes on the earth’s surface
c. the motion of continents
d. how seismic waves travel

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?