The half-life of uranium-235 is 700 million years. If you start with 10 atoms of it, how many will you have left after 700 million years?

A)5
B)0
C)9
D)20

Waianapanapa beach in hawaii is a black-sand beach that was formed by waves crashing against volcanic rock. the sand can be very hot on sunny days. which statement best explains why? o a. the black sand has no heat capacity. b. the black sand absorbs no radiation. o c. the black sand is immune to insolation. d. the black sand has a low albedo.