Soil Erosion

SOIL EROSION The washing away or blowing away of topsoil. Trees and other plants hold the soil in place and help reduce the force of the wind. Soil erosion happens when trees and plants are cut down.

Stone Mulching

STONE MULCHING Placing rocks and stones around plants, usually trees, to prevent moisture loss by the sun’s evaporation and to stop weeds.

Sunlight Zone

SUNLIGHT ZONE The upper 488 feet (150 m) of the ocean, where sunlight penetrates and where about 90 percent of all marine life live.


SALINITY The degree of salt in water. The rise in sea level due to global warming would result in increased salinity of rivers, bays and aquifers. This would affect drinking water, agriculture and wildlife.