What feature indicated a period of heavy bombardment followed by a. of low bombardment in our solar system?

Which of the following planets is classified as a terrestrial planet? a. neptune b. venus c. saturn d. jupiter

5. what is a red giant? can our sun become a red giant? why or why not?

The covers all of earth like a thin shell,but it is not a solid sheet of material.it is broken up into several large sections and many smaller ones. fill in the blank.