The greenhouse effect- global warming

Question 1

Where does Earth get most of its energy from?

Answer 1

The Earth receives most of its energy in the form of electromagnetic radiation from the sun.

Question 2

Define the greenhouse effect

Answer 2

The greenhouse effect is the process in which the absorption and subsequent emission of infra-red radiation by atmospheric gases warms the lower atmosphere and the planet’s surface.

Question 3

Explain how the green house effect creates an equilibrium.

Answer 3

The Earth’s surface and atmospheric gases absorbs energy at the same rate as it radiates energy, thus maintaining a steady temperature.

Question 4

Name some of the greenhouse gases and how they are produced.

Answer 4

• Water vapour- evaporation of lakes and oceans.
• Carbon dioxide- Produced mainly by natural processes: -Volcanic eruptions, respiration of animals
• methane- emitted during the production of coal,natural gas and oil. Released from certain animals.

Question 5

Explain how the green house gases absorb radiation and emit.

Answer 5

Carbon dioxide, water vapour and methane absorb energy. The bonds absorb infra-red radiation.
- Eventually, the vibrating molecule emits some of this energy in the form of radiation. This can then be absorbed by another greenhouse gas molecule or at the Earth’s surface.

Question 6

What does the greenhouse effect of a gas depend on?

Answer 6

• The concentration of the gas in the atmosphere but also its ability to absorb infrared radiation.