When the Moon rises at approximately 12 noon, it is in the ______________ phase
a. first-quarter
b. last-quarter
c. new
d. full
c
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The major difference in the composition of Earth's atmosphere compared to the atmospheres of Venus and Mars is a direct consequence of
a. life on Earth. b. Earth's plate tectonics. c. differences in the greenhouse effect. d. the presence of liquid water. e. differing distances from the Sun.
The amount of gravitational force that acts on a space vehicle while in Earth orbit is
A) nearly zero. B) nearly as much as the vehicle's weight on Earth's surface. C) the same as the vehicle's weight on Earth's surface.
A certain source of sound waves radiates uniformly in all directions. At a distance of 20 m from the source the intensity level is 51 db
What is the total acoustic power output of the source, in watts? (Note: The reference intensity I0 is 1.0 × 10-12 W/m2.)
If atomic hydrogen can destroy ozone, and most of the matter in the universe is hydrogen, why is hydrogen not a major cause of ozone depletion?
What will be an ideal response?