Which of the following energy forms is associated with an object in motion?
a. potential energy
c. nonmechanical energy
b. elastic potential energy
d. kinetic energy

Which feature indicates that mars resides in the inner region of the solar system

What would be the radius of the earth if it had its actual mass but had the density of nuclei? express your answer to two significant figures and include the appropriate units.

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?