Across
1
Glass that splits light into spectrum
2
Unit of force
4
Mass per unit volume
6
Center of an atom or cell
7
Tissue that contracts for movement
9
Push or pull on an object
Down
1
Positive particle in nucleus
3
Blocking of light by a celestial body
5
Hottest planet in solar system
8
Unit of power
10
Gas essential for breathing
11
Smallest unit of an element