The ________ era is known as the "age of flowering plants."
A) Precambrian
B) Paleozoic
C) Cenozoic
D) Devonian
E) Silurian
Answer: C) Cenozoic
Environmental & Atmospheric Sciences
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How many electrons are gained or lost in the following half-reaction? C ? C-4
A) 2 electrons are lost B) 1/2 electron is gained C) 1/2 electron is lost D) 2 electrons are gained E) 4 electrons are gained
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Reserves of fossil fuels
A. are dependent on technological advances. B. have been unchanged for several decades. C. decline as fossil fuels are used. D. increased renewable energy sources replace fossil fuels.
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The average adult requires about ________ pounds of air a day
A) 100 B) 5 C) 30 D) 500
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How many active volcanoes are there on Earth?
A. between 500 - 1,500 B. less than 500 C. more than 1,500
Environmental & Atmospheric Sciences