Across
1
Naturally occurring inorganic solid
4
Hottest planet in solar system
7
Amplified beam of light
8
Force that attracts objects together
11
Curved glass that refracts light
12
Biological catalyst
Down
2
Preserved remains of ancient life
3
Unit of energy
5
Mass per unit volume
6
Basic unit of life
9
Second lightest element
10
Unit of electric potential