That the Tharsis region on Mars has so few craters:
A) proves tectonic activity is taking place.
B) is due to the regions very low elevation.
C) suggests it is the youngest region on the planet.
D) suggests it is at the center of a particularly strong magnetic field.
E) is due to annual flooding and water erosion.
C
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Why are radio waves probably the most efficient way to communicate between civilizations?
A) radio waves are easy to produce and are not affected much by interstellar matter in the galaxy B) radio waves are the most penetrating of all electromagnetic radiations C) all advanced civilizations are certain to use radio waves for communication D) radio waves are the only kind of electromagnetic radiation that can carry information
A region of expanding air tends to
A) cool. B) warm. C) both of the these D) neither of these
The gravitational force is a conservative force
Indicate whether the statement is true or false
The proper abbreviation for ‘grams' is ‘g.'
a. True b. False Indicate whether the statement is true or false