Explain how the changing climate influenced the formation of the Bering land bridge, and how this affected migration of humans and animals
What will be the ideal response?
ANSWER: The most recent North American glaciers reached their maximum thickness and extent about 18,000 to 22,000 years ago. At that time, the sea level was perhaps 120 m (395 ft) lower than it is now. The lower sea level exposed vast areas of land, such as the Bering land bridge, a strip of land that connected Siberia to Alaska, which allowed human and animal migration from Asia to North America.
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How much has CO2 varied in the Vostok record? What were the highest and lowest values? What was the range of CO2 values?
Examine Figure 18.2. The Vostok ice core is 3310 m (10,860 ft) long. The full record extends back to 422,000 years before the present. The figure shows CO2 in parts per million (ppm) and temperature anomalies in Celsius degrees. What will be an ideal response?
Explain the difference between global warming and the greenhouse effect
What will be an ideal response?
Which of the following conditions would be the LEAST likely to increase a person's risk of hypothermia?
A. hypoperfusion B. severe infection C. hyperglycemia D. spinal cord injury
Which of the following weathering processes results in the reddish orange coating on rocks, in soils, and on metal (rust)?
A. salt crystallization B. differential weathering C. oxidation D. freeze thaw