Across
1
Reddish electrical conductor
3
Infectious microscopic agent
4
Molten rock beneath Earth surface
5
Unit of power
9
Compound containing oxygen
Down
2
Force that attracts objects together
4
Measure of matter in an object
6
Ball of burning gas in space
7
Biological catalyst
8
Unit of energy
10
Unit of force
11
Smallest unit of an element