Across
1
Force that attracts objects together
3
Tissue that contracts for movement
6
Positive particle in nucleus
7
Basic unit of life
9
Unit of power
10
Molten rock beneath Earth surface
Down
1
Precious yellow metallic element
2
Chemical element in table salt
4
Measure of matter in an object
5
Unit of energy
7
Icy body with a tail near the sun
8
Smallest unit of an element