A measure of the space that matter occupies.

A combination of two or more substances that do not chemically combine and can be separated.

A measure of how much matter is present in a

substance

The cool, rigid, outermost layer of Earth that consists of the crust and the uppermost part of the mantle; broken into pieces or segments called plates

All the water on Earth’s surface; includes all water sources above and below the surface

The layer of gas surrounding a planet that is held in place by gravity

The sum of all living matter on Earth

The smallest particle of an element; made of electrons, protons, and neutrons.

A combination of two or more substances that do not chemically combine and can be separated.

A pure substance composed of the same type of atom throughout.