Which of the following make it difficult to develop mathematical models of climate?
A. lack of understanding of the fundamental cause of global warming
B. the fact that Earth's climate has varied much over its 4.6 billion-year history
C. negative feedback loops
D. positive feedback loops
Answer: D
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Which of the following is not an economic service provided by marine ecosystems?
a. source of animal and pet feed b. nutrient cycling c. provides harbors and transportation routes d. provides employment e. source of minerals, oil, and natural gas
What is the main concern of legislation such as RCRA that is embodied in the approach used in
sanitary landfills? What will be an ideal response?
Agriculture is the most widespread primary economic activity.
Answer the following statement true (T) or false (F)
This country does NOT border the Red Sea:
A) Iraq B) Saudi Arabia C) Egypt D) Yemen