Which statement describes the size of the inner planets?

All the inner planets, except Mercury, are large.
The inner planets are larger than the outer planets.
All the inner planets are smaller than the outer planets.
Mars is a large planet, while the other inner planets are small.

You get 6 for mechanical

It is d, all the other ones say incorrect answer .

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

The geological theory that states that pieces of earth's lithosphere are in constant slow motion is the theory of plate tectonics.