The places where the Sun crosses the equator are called the:
A) annalemmas.
B) prime meridians.
C) zeniths.
D) equinoxes.
E) solstices.
D
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The scientific method is a ___________________ by which scientists form hypotheses and test them agains evidence gathered by observation or experiment
Fill in the blank(s) with correct word
What is the galactic fountain model?
A) a model in which interstellar water vapor can condense to form liquid water rain drops falling toward the galactic disk B) a model that assumes the Milky Way is a spiral galaxy and looks like a whirlpool from above C) a model in which jets of hot, ionized gas blow out of the galactic center and leave the galaxy forever D) a model in which superbubbles blow hot, ionized gas out of the galactic disk and into the halo, where the gas cools down and falls back into the disk
The main process by which heat flows upward through the lithosphere is
A) conduction. B) convection. C) radiation. D) accretion. E) differentiation.
As I pull a rope connected to a box at constant speed up a frictionless slope, pulling parallel to the slope, the tension in the rope will be:
a. greater than the tension would be if the box were stationary. b. greater than the weight of the box. c. equal to the weight of the box. d. less than the weight of the box.