Why do we think Mars had more volcanic activity in the past than it does today?
a. Mars was bombarded with more impacts in the past, which fueled more volcanic activity.
b. Mars’ interior would have been warmer in the past.
c. Some meteorites from Mars come from relatively young lava.
d. All of the above.
e. b and c.
Answer : e. b and c.
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The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by
?
and 
.
?
The plane is most likely
A. just touching down. B. in level flight in the air. C. ascending. D. descending. E. taking off.
The upward force exerted by a fluid on an object immersed in it is called
a. gravitational force b. atmospheric force c. buoyant force d. weight e. none of the above
According to Kepler's laws the Sun is located at one of the foci of Earth's orbit.
Answer the following statement true (T) or false (F)
Explain why California would mandate the installation of catalytic converters in cars at a time when their use cost energy and degraded performance
What will be an ideal response?