Question

question 7
the loss of ice cover in the arctic will
a endanger resident species.
b raise the ocean temperature.
c raise the air temperature.
d increase sea levels.
e all of these.
question 8
which human activities contribute to elevated carbon dioxide levels in the atmosphere?
a driving gasoline - powered cars
b burning of coal
c burning of oil
d burning of forests
e all of these.

Explanation:

• Question 7:
• The loss of Arctic ice cover endangers resident species (e.g., polar bears rely on ice for hunting).
• Less ice means less reflection of sunlight (ice has a high albedo), more absorption of solar radiation, which raises ocean and air temperatures.
• Melting ice (from land - based ice like glaciers, though Arctic sea - ice melting doesn't directly raise sea levels as much as land - ice, but overall Arctic ice loss is part of a larger climate change picture where other ice masses are also melting) contributes to sea - level rise.
• Question 8:
• Driving gasoline - powered cars combusts fossil fuels (gasoline is a fossil fuel product), releasing \(CO_2\).
• Burning coal, oil (both fossil fuels) releases \(CO_2\) as they are carbon - rich.
• Burning forests (deforestation by burning) releases the carbon stored in trees as \(CO_2\) and also reduces the number of trees that can absorb \(CO_2\) through photosynthesis.

Answer:

• Question 7: E. All of these
• Question 8: E. All of these