How did Mr. Hubble calculate the age of the universe?
A. by measuring the rate of expansion of the universe
B. by measuring the redshift of stars within 360 degrees of the center of our galaxy
C. by measuring the rate of radioactive decay within the farthest galaxies
D. by looking at the age of the oldest stars
Answer: A
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The "stratosphere" warms because of:
A) dust and dirt deposited by volcanoes. B) the interaction of ozone and ultraviolet light. C) the injection of moisture by meteors. D) the injection of moisture by high-flying jet aircraft.
Why is biosynthesis unlikely to occur today as it did in Earth's youth?
A) Living organisms have altered oceanic and atmospheric conditions B) There is less available oxygen in the atmosphere C) Ozone is less protective from the sun's influence D) All of these choices are true
The Sahara desert receives little precipitation because [INSERT FIGURE 8-7a. NO CAPTION]
A) it is very close to the intertropical convergence zone B) it is near the equator C) it is usually under the influence of a semipermanent low pressure cell D) it is usually under the influence of a semipermanent high pressure cell
The Moon has highland areas which approach the height of mountains on Earth
Indicate whether the statement is true or false