The continental crust has an average age of ________ and a maximum age of ________
A) 1.2 billion; 3.9 billion
B) 1.6 billion; 4.0 billion
C) 1.8 billion; 3.2 billion
D) 2.2 billion; 4.4 billion
Answer: D
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Answer the following statement true (T) or false (F)
Which of the following statements about Earth's carrying capacity for humans is true?
a. Human beings are not unlike other animals concerning carrying capacity, but we utilize technology to artificially raise the carrying capacity increasingly higher. b. Earth can support an infinite number of humans. c. Earth's carrying capacity for humans is approximately 350 million people. d. Humans do not have a carrying capacity because we are at the top of the food chain.
In a solution of 77 percent nitrogen and 23 percent oxygen, which is the solvent?
A) nitrogen B) oxygen C) both D) neither E) Gases cannot form solutions.
How were Neanderthals different from modern humans?