VCE Environmental Science UNIT 4 - AOS 1 Questions & Answers
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Course
VCE Environmental Science UNIT 4
Institution
VCE Environmental Science UNIT 4
Natural greenhouse effect - ANSWERSThe layer of greenhouse gases in the atmosphere retains the sun's radiation to heat the Earth at 15oC. It sustains all life on Earth.
The most common greenhouse gas is water vapour
Cause of natural greenhouse effect - ANSWERS- Volcanic eruptions
- Forest fire...
VCE Environmental Science UNIT 4 -
AOS 1 Questions & Answers
Natural greenhouse effect - ANSWERSThe layer of greenhouse gases in the
atmosphere retains the sun's radiation to heat the Earth at 15oC. It sustains all life on
Earth.
The most common greenhouse gas is water vapour
Cause of natural greenhouse effect - ANSWERS- Volcanic eruptions
- Forest fires
- Methane through decomposition and wetlands
Enhanced greenhouse effect - ANSWERSRising global temperatures due to
greenhouse gases being put into the atmosphere because of anthropogenic (human)
sources
Causes of the enhanced greenhouse effect - ANSWERS- Combustion of fossil fuels
(coal, oil)
- Vehicle use
- Land use change
- Deforestation (loss of carbon sinks/vegetation cover)
- Urbanisation
- Chemical manufacturing (CFCs)
Human-made greenhouse gases - ANSWERS- increased carbon dioxide
- increased methane - (agriculture)
- Chlorofluorocarbons (CFCs), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs),
sulphur hexafluoride (SF6)
- They are found in aerosol sprays, air conditioning and refrigerants and in electronics
Impact of the enhanced greenhouse effect - ANSWERSHIGHER GLOBAL
TEMPERATURE MEANS:
- Flooding in coastal areas → relocation
- Ice melting → sea level rising
- Coastal erosion
- Coral bleaching
- Damage to aquatic ecosystems
- Ocean acidification
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