Section 5.1 questions

. Refer to the figure.

The three factors shown in the graphs provide evidence supporting the hypothesis that CO₂emissions by humans are associated with rising atmospheric CO₂ and temperature. The graphs support the hypothesis because all three factors are

measured within the atmosphere.

measured indirectly.

rising at approximately the same rate.

rising at very slight, insignificant rates.

. Which of these examples represents an impact of climate change on a living system?

The hottest year so far in the historical record was 2016.

Arctic sea ice reached a record low in 2017.

Extreme weather events such as hurricanes and snowstorms are increasing.

The ranges of European butterflies are moving north as global temperatures rise.

. At atmospheric temperatures rise, concurrent rises occur in ocean temperatures. In addition, excess atmospheric CO₂ enters the oceans and dissolves to form carbonic acid, which increases ocean acidity. As these processes continue, what is the likely future impact on the world's coral reefs?

No likely impact; these processes do not impact corals.

More reefs will die due to bleaching as temperature and acidity rise.

Reefs will die off in the short term but will recover and adapt to the new acidity levels.

Reef health will improve, and growth will increase as temperature and acidity increase.

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