Science

2. an instance of revolving.
4. the degree of compactness of a substance.
5. a small nucleus (positively charged) surrounded by negative electrons moving around the nucleus in orbits.
7. the sum of all the forces acting on an object.
8. An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus.
10. the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
11. the basic unit of a chemical element.

1. a system of interlocking and interdependent food chains.
3. a table of the chemical elements arranged in order of atomic number, usually in rows
6. lunar phase, any of the varying appearances of the Moon
9. the action of rotating around an axis or center.
11. increase in the rate or speed of something.