9781422274569

WORDS TO UNDERSTAND

aerator an apparatus for exposing something to the air

arid lacking sufficient water or rainfall

chlorine a common nonmetallic element used to purify water and as a bleaching agent and disinfectant

debris the remains of something that has been destroyed or broken up

distilled remove impurities from, increase the concentration of, and separate through the process of distillation

dripper a device that discharges water on the area that needs to be irrigated

efficient being effective without wasting time, effort, or expense

faucet a regulator for controlling the flow of a liquid from a reservoir

gravel rock fragments and pebbles

hydrophobic tending to repel, and not absorb water or become wet by water

impending close in time; about to occur

intrude enter uninvited

migration the movement of persons from one country or locality to another

native originated in the same geographic region

porous able to absorb fluids

CLIMATE CHANGE: Problems and Progress

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