RES Teen 3 Pre-Test Review

When (a)   happens, the water temperature in streams, rivers, lakes and oceans changes.

(a)   occurs when the atmosphere contains gasses, dust or fumes in harmful amounts.

When radiation gets into the land, air or water, it is called (a)   .

Too much use of electric lights in cities may cause (a)   .

(a)   is the contamination of lakes, rivers, oceans or underground water, usually by human activities.

(a)   happens when human activities destroy the Earth's surface.

The sight of too many telephone poles, advertising billboards, overhead power lines or shop signs may cause (a)   .

The number of people in a place in relation to its area.

• overcrowded

• slum

• density

• spacious

A market usually held outdoors.

• flea market

• slum

• overpopulation

• megacity

A very large city, typically one with a population of over 10 million.

• population explosion

• overcrowded

• overpopulation

• megacity