What marks the boundary between the Mesozoic and the Cenozoic (called the K-P boundary)?
A. the start of a rise to dominance of mammals
B. the extinction of the dinosaurs
C. a meteorite impact in Mexico
D. All of these choices are correct.
Answer: D
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The length of time preserved in Grand Canyon rocks is about:a
10,000 years. b. 100,000 years. c. 1 million years. d. 1 billion years. e. 10 billion years
Which of the following ions has the same electronic configuration as argon?
A) K+ B) Ca2+ C) both a and b D) neither a nor b
Earth's orbit around the Sun is highly elliptical.
Answer the following statement true (T) or false (F)
The frequency of reported tornadoes would be favored by all the conditions EXCEPT
A. north south mountain chains. B. proximity to a supply of warm moist air. C. sophisticated detection ability. D. upper level wind shear.