Density

A large natural stream of water flowing in a channel to the sea, a lake, or another stream.

the salt content of water

a large body of water surrounded by land

an underground layer of rock or sediment that holds water

the average kinetic energy of the particles in a substance.

water that fills the cracks and spaces underground soil and rock layers

a gently sloping, shallow area of ocean floor that extends outward from the edge of the continent

a steep incline of the ocean floor leading down the edge of the continental shelf

an area that strentched from the highest high-tide line on land out to the point on the continental shelf exposed by the lowest tide

a region in which a layer of limestone close to the surface creates deep valleys, caverns, and sinkholes

the deepest, darkest area of the ocean beyond the edge of the continental shelf

the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.

a lake that stores water for human use

a submarine mountain

an area of low-lying uncultivated ground where water collects

the land that supplies water to our river system

a deep, steep sided canyon in the ocean floor

an undersea mountain chain where new ocean floor is produced.