Across
1
Gas essential for breathing
4
Amplified beam of light
5
Naturally occurring inorganic solid
7
Push or pull on an object
9
Nerve cell in the brain
11
Particle of light
Down
1
Path of a planet around the sun
2
Solid with repeating atomic pattern
3
Blocking of light by a celestial body
5
Measure of matter in an object
6
Positive particle in nucleus
8
Smallest unit of an element
10
Gas form of a liquid