Across
1
Reddish electrical conductor
2
Unit of heredity
4
Natural satellite of Earth
5
Biological catalyst
8
Amplified beam of light
9
Element found in all living things
11
Solid with repeating atomic pattern
Down
2
Force that attracts objects together
3
Particle of light
6
Molten rock beneath Earth surface
7
Gas essential for breathing
10
Second lightest element