The solid part of Earth made up of rocks, soil, and landforms.

All the living things on Earth, including plants, animals, and people.

The layer of gases that surrounds Earth and provides the air we breathe.

All the water on Earth, including oceans, rivers, lakes, groundwater, and water vapor.

The process by which liquid water changes into water vapor because of heat from the Sun.

The process when water is released from plant leaves into the air as water vapor.

The process by which water vapor cools and changes into liquid water droplets to form clouds.

The process where a liquid turns into a solid crystal, such as when water freezes into ice.

Water that is found underground in cracks and spaces in soil and rock.

Any form of water that falls from clouds to Earth’s surface, such as rain, snow, sleet, or hail.

The continuous movement of water through Earth’s systems, powered by energy from the Sun and gravity.

An underground layer of rock or soil that can hold and supply groundwater.

Having tiny holes that allow liquid or air to pass through.

Allows liquids to flow through easily because of connected pores or spaces.

Water that flows over Earth’s surface instead of soaking into the ground.

The process of water soaking down into the ground through soil and rock.

The temperature at which a liquid changes into a gas (for water, 100°C or 212°F).

The temperature at which a liquid turns into a solid (for water, 0°C or 32°F).