A warm spell called the Bölling-Alleröd period occurred about 6,000 years ago
a. True
b. False
ANSWER: False
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Residence time is the average length of time an element spends in the ocean
Indicate whether the statement is true or false
Oxygen-isotope analysis:
A) cannot be carried out on ice cores or sea floor sediments, but works well for tree ring analysis. B) has been shown to be of little or no use in the study of past climatic changes. C) relies on the fact that 16O evaporates from the ocean more readily than 18O. D) is very simple.
Urban development-such as building roads, parking lots, buildings, and sidewalks-reduces the recharge of groundwater.
Answer the following statement true (T) or false (F)
Though Khartoum and Urumqi both have dry BW climates, temperatures are much more variable for Urumqi. Why? 
A. Khartoum's latitude B. Urumqi's latitude C. Urumqi's rain shadow D. Khartoum's rain shadow