Basins/Oceans

Front

the land that water flows across on its way to a river.

Back

River basin

Front

a semi-enclosed area where fresh water from a river meets salty water from the sea.

Back

Estuary

Front

the land drained by a river, stream or lake.

Back

Watershed

Front

water found in cracks and pores in sand, gravel and rocks below the earth’s surface.

Back

Groundwater

Front

a natural system linked by living (plants, animals) and nonliving (soil, air, water) things.

Back

Ecosystem

Front

a porous rock layer underground that is a reservoir for water.

Back

Aquifer

Front

the variety of life in the world or in a particular habitat or ecosystem.

Back

Biodiversity

Front

the total quantity or weight of organisms in a given area or volume.

Back

Biomass

Front

the salt concentration in seawater.

Back

Salinity

Front

the uppermost layer of a body of water that receives sunlight.

Back

Photic Zone