soil deposit at the mouth of a river

circular-shaped islands made of coral

a body of water separated from larger bodies of water by a natural barrier

producing or able to produce large amounts of goods or crops

too much eating which causes damage to grassland.

underground layer of rock through that holds groundwater

(we've had this word before)

the process by which the surface of the earth is worn away by the action of water, glaciers, winds, waves, etc.

visible air pollution consisting of chemicals, ash, and dust

area of relatively flat high ground