What is the most important factor that determines the thickness, and therefore strength, of the lithosphere?
A) pressure
B) viscosity
C) composition
D) internal temperature
E) distance of planet from Sun
D
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The carbon in a certain ancient ax-handle is only 1/8--one-eighth--as radioactive as the carbon in living wood. The half-life of 14C is 6000 years. From these facts we can conclude that
A) the ax-handle was made from an unusual type of wood that was less radioactive than normal wood. B) the ax-handle is about 18,000 years old. C) the natural carbon-radioactivity at the time the ax-handle was made was only one-eighth of what it is today. D) the ax-handle is about 12,000 years old. E) the ax-handle is about 48,000 years old.
Acceleration: Suppose that an object is moving with a constant velocity. Which statement concerning its acceleration must be correct?
A. The acceleration is constantly increasing. B. The acceleration is constantly decreasing. C. The acceleration is a constant non-zero value. D. The acceleration is equal to zero.
The Big Bang theory is supported by two major lines of evidence that alternative models have not successfully explained. What are they?
A) (1) the existence and specific characteristics of the observed cosmic microwave background (2) the observed overall chemical composition of the universe B) (1) the early universe was hot and dense (2) we see distant galaxies as they were in the distant past C) (1) the episode of inflation thought to have occurred in the early universe (2) the separation of gravity and the other forces at the end of the Planck era D) (1) the universe is expanding (2) the observed ratio of spiral to elliptical galaxies in the universe
Most stars, probably all stars, formed:
A) in a binary system. B) in a triple system. C) in a cluster of stars. D) all by themselves. E) There is no theory to predict this.