_______________ produces the majority of the geological activity on Earth
Fill in the blank(s) with correct word
Plate tectonics
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In order for a substance to sustain a fission chain reaction, one important condition is that
A) each fissioning nucleus must release a sufficient number of neutrons. B) the nuclei must collide with enough energy to overcome the electrical repulsion between them. C) each fissioning nucleus must release a sufficient number of alpha-particles. D) energy must be continually supplied from the outside. E) the nuclei must stay in shape by maintaining a regular jogging program.
General Questions: The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can apply a horizontal force 
either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is
A. zero newtons in either case.
B. larger if 
is applied toward the right.
C. larger if 
is applied toward the left.
D. the same in either case.
Jupiter lies about 5 AU from the Sun, so at its distance
A) the Sun's gravity is just as strong as it is here at Earth. B) the Sun's gravity must be five times stronger to hold massive Jupiter in orbit. C) the Sun's gravity is five times weaker there than at one AU distance. D) the Sun's gravity is 25 times weaker than its pull on the Earth. E) the Sun's gravity is so weak that ultimately Jupiter will escape the solar system.
Which of the following is not a characteristic of the stars of the disk component of our galaxy?
a. circular orbits b. randomly inclined orbits c. higher metal abundance d. young stars e. star-formation regions