Unit 5: Global warming

Global warming refers ______ the increase in the earth's temperature.

• with
• to
• from
• for

Some gases are _______ into the air through human activities.

• dissolved
• condensed
• absorbed
• released

Wind and sunlight are examples of ___________ sources of energy.

• Nuclear
• Renewable
• Fossil fuel
• Non-renewable

The students took _______ in green activities, were planting more than 100 trees.

• part
• apart
• apathy
• apron

________, such as gas, coal, and oil, were formed underground from plant and animal remains millions of years ago.

• Fossil fuels
• Renewable energy
• Nuclear power
• Wind energy

Carbon dioxide is known as _______

• helium gas
• greenhouse gas
• nitrogen gas
• oxygen gas

Global warming is also linked to _______ sea levels.

• rising
• raising

• stagnant
• falling

Higher sea levels can also ________ to flood.

• result

• lead

• cause

• lessen

Global warming has a negative _______ on the environment and people gets stronger.

• influence
• impact
• affect

• benefit

If carbon dioxide is produced in huge amounts, it causes air pollution and _______ change.

• temperature
• ocean
• soil
• climate