Across
1
Force that attracts objects together
4
Glass that splits light into spectrum
5
Molten rock beneath Earth surface
10
Icy body with a tail near the sun
11
Fourth state of matter
Down
2
Infectious microscopic agent
3
Smallest unit of an element
6
Unit of heredity
7
Blocking of light by a celestial body
8
Second lightest element
9
Natural satellite of Earth
10
Element found in all living things