The graph above shows the composition of Earth's crust and the Moon's crust.
For which element is there the greatest
difference between the percent by
mass on the Moon and the percent by
mass on Earth?

Silicon
Magnesium
Oxygen
Iron

What is called the "building block" of life?

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.

What is the primary function of the nervous system?