Across
1
Ball of burning gas in space
3
Basic unit of life
4
Disturbance that transfers energy
5
Positive particle in nucleus
7
Chemical element in table salt
10
Amplified beam of light
Down
2
Center of an atom or cell
3
Solid with repeating atomic pattern
6
Molten rock beneath Earth surface
8
Measure of matter in an object
9
Our home planet