Across
1
Force that attracts objects together
4
Amplified beam of light
6
Precious yellow metallic element
7
Unit of electric potential
8
Biological catalyst
10
Chemical element in table salt
Down
1
Unit of heredity
2
Ball of burning gas in space
3
Preserved remains of ancient life
5
Element found in all living things
9
Natural satellite of Earth
11
Curved glass that refracts light
12
The Red Planet