Across
1
Mass per unit volume
4
Preserved remains of ancient life
6
Naturally occurring inorganic solid
10
Curved glass that refracts light
11
Smallest unit of an element
12
Path of a planet around the sun
13
Gas form of a liquid
Down
2
Basic unit of life
3
Ball of burning gas in space
5
Fourth state of matter
7
Amplified beam of light
8
Unit of power
9
Blocking of light by a celestial body
14
Chemical element in table salt