The average speed of rotation at the equator is . per hour

The earth rotates once every 23 hours, 56 minutes and 4.09053 seconds, called the sidereal period, and its circumference is roughly 40,075 kilometers. Thus, the surface of the earth at the equator moves at a speed of 460 meters per second--or roughly 1,000 miles per hour.

b is the right answer for this question.

the following sets of characteristics describe what we know about the outer plants is c. rocky surface, closet to the sun and larger in size