1. State one way by which the polar regions of Earth can affect global climate.
ID: 112806 • Letter: 1
Question
1. State one way by which the polar regions of Earth can affect global climate. 2. State two reasons why CO2 concentration is on average higher in the northern hemisphere. 3. Name (or describe, either) one geophysical process through which CO2 is added to the atmosphere. 4. Name (or describe, either) one geophysical process through which CO2 is removed from the atmosphere. 5. Why were the snowball Earth states short-lived in comparison to the hot house states? 6. What was the main driver of the Pleistocene (2.6 million years ago to 11,000 years ago) glacial cycles (ice ages)? 7. State two ways in which organisms altered Earth's geophysical environment.Explanation / Answer
1) Generally snow and ice reflect 90 % of the solar radiation falling on it.
When global warming occurs this causes more melting of snow and ice. So more water vapor is released into the atmosphere. Water vapor is a strong greenhouse gas.It absorbs more heat.
When water vapor increases in the atmosphere, it traps more heat . So the global temperature increases.As the global temperature increases, it causes more snow and ice to melt , which causes more water to evaporate.
More water vapor in the atmosphere, traps more heat.Then causes more melting of snow and ice producing more water vapor in the atmosphere.This is a positive feedback cycle.
So ultimately there is more global warming and global climate change.
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