A giant wave usually caused by an earthquake beneath the ocean floor.

A description of surface features of land.

Any process that breaks rock down into smaller pieces without changing the chemistry of the rock; typically wind and water.

The change of a substance from a liquid to a gas

(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other

how bright a star actually is

The process by which two or more small nuclei fuse to make a bigger nucleus

(astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto

The color of a mineral in powdered form

A large cloud of dust and gas in space