Across
1
Positive particle in nucleus
4
Molten rock beneath Earth surface
6
Force that attracts objects together
7
Infectious microscopic agent
9
Magnetic metallic element
11
Blocking of light by a celestial body
Down
1
Fourth state of matter
2
Unit of electric potential
3
Unit of heredity
5
The Red Planet
8
Gas form of a liquid
10
Second lightest element