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

Environmental & Atmospheric Sciences

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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.

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Earth's orbit around the Sun is highly elliptical.

Answer the following statement true (T) or false (F)

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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

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