Across
1
Molten rock beneath Earth surface
3
Measure of matter in an object
5
Reddish electrical conductor
6
Nerve cell in the brain
7
Hottest planet in solar system
8
Push or pull on an object
Down
1
Natural satellite of Earth
2
Chemical element in table salt
4
Force that attracts objects together
5
Icy body with a tail near the sun
6
Center of an atom or cell