The oldest rocks that have been dated by radioactivity are approximately
A) 2 million years old.
B) 200 million years old.
C) 4 billion years old.
D) 10 billion years old.
Answer: C
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By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding.
A) All galaxies contain billions of stars, and all galaxies have spiral shapes. B) All galaxies were born at the same time, and all will die at the same time. C) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going. D) All galaxies outside the Local Group are orbiting the Local Group. E) Galaxies are in motion throughout the universe, with about equal numbers moving toward us and away from us.
When water freezes, it expands about nine percent. What would be the pressure increase inside your automobile engine block if the water in there froze? (The bulk modulus of ice is 2.0 × 10^9 Pa, and 1 atm = 1.0 × 10^5 Pa.)
a. 18 atm b. 270 atm c. 1 080 atm d. 1 800 atm
The two main distinguishing characteristics of an air
mass are a) size and shape. b) pressure and wind speed. c) cyclonic rotation and speed of movement. d) temperature and moisture content
The entropy of a system measures its:
a. organization – disordered systems have low entropy. b. organization – disordered systems have high entropy. c. energy – low energy systems have low entropy. d. energy – low energy systems have high entropy. e. temperature – high temperature systems have low entropy.