Across
1
Tissue that contracts for movement
3
Glass that splits light into spectrum
7
Push or pull on an object
8
Naturally occurring inorganic solid
9
Mass per unit volume
Down
1
The Red Planet
2
Substance with pH below 7
3
Particle of light
4
Measure of matter in an object
5
Blocking of light by a celestial body
6
Ball of burning gas in space