Choose the one word or phrase that best completes the sentence and fill in the appropriate answer above.
1-
......... forms of energy are environmentally-friendly methods of producing usable sources of energy. For example, people are trying to harness wind and solar sources of energy.
A -
Instead
B -
Alternative
C -
Acid
2-
When a lot of pollution enters the atmosphere, we sometimes experience ......... rain. This is when harmful chemicals are released along with water vapor and rainfall.
A -
act
B -
flow
C -
acid
3-
......... occurs when a large variety and number of plants and animals coexist in a certain area. We have to protect this so that ecosystems are not disrupted.
A -
Biodiversity
B -
Aerosol
C -
Fuels
4-
Trash that is comprised of organic and natural substances and that can be broken down into harmless waste is called......... . Once broken down, the harmless material can then be absorbed back into the environment without any bad effects.
A -
biodegradable
B -
aquaculture
C -
feedlots
5-
Nowadays, many people are exploring and using alternative ......... sources (other than gasoline sources) in transportation sectors including natural gas, electricity, ethanol and methanol blends.
A -
fiber
B -
fuel
C -
asthma
6-
Many people are worried about ......... change. This is when changes in temperature and weather patterns occur in a particular area. Scientists think there is a connection between fossil fuel emission levels and this phenomenon.
A -
grasp
B -
climate
C -
board
7-
Some governments around the world have implemented emission ......... . This is a decided upon limit placed on levels of toxic and harmful emissions that one company or country, in general, is legally permitted to release into the atmosphere.
A -
forms
B -
dumps
C -
caps
8-
Dumpsites or......... are waste disposal areas. We should try to reduce our consumption levels so that we don't have to create more of these areas in the future.
A -
landfills
B -
estuaries
C -
creeks
9-
The ......... effect refers to air pollutants, such as carbon, nitrides and methane gases, that trap much of the world's heat under layers of these pollutants. As a result, this phenomenon has caused a steady increase in the earth's atmospheric temperature.
A -
engross
B -
greenhouse
C -
captivate
10-
People have used ......... fuels such as oil, coal and natural gas for a long time. These limited resources were created when ancient life forms decomposed. However, we have to find other forms of energy in order to save the planet.
