Chapter 21

Question 0

Pesticides

Answer 0

A chemical that is used to kill animals or insects that damage plants or crops.

Question 1

Pollution

Answer 1

Substances that make water, air,etc. dirty and not safe or suitable to use.

Question 2

Acid rain

Answer 2

Rain that contains dangerous chemicals because of smoker rom cars and factories.

Question 3

Smog

Answer 3

Fog mixed with smoke: a cloud of dirty air from cars,factories , etc…. That is usually found in cities

Question 4

Ozone layer

Answer 4

Protects us from the suns UV rays

Question 5

Greenhouse effect

Answer 5

warming of the surface and lower atmosphere of a planet (as Earth or Venus) that is caused by conversion of solar radiation into heat in a process involving selective transmission of short wave solar radiation by the atmosphere, its absorption by the planet’s surface, and reradiation as infrared which is absorbed and partly reradiated back to the surface by atmospheric gases

Question 6

Global warming

Answer 6

: the recent increase in the world’s temperature that is believed to be caused by the increase of certain gases (such as carbon dioxide) in the atmosphere

Question 7

Landfills

Answer 7

: a system in which waste materials are buried under the ground
: an area where waste is buried under the ground

Question 8

Hazardous waste

Answer 8

: involving risk or danger