Across
1
Icy body with a tail near the sun
4
Nerve cell in the brain
6
Biological catalyst
7
Gas form of a liquid
10
Hottest planet in solar system
Down
1
Element found in all living things
2
Force that attracts objects together
3
Chemical element in table salt
5
Form of thermal energy
8
Second lightest element
9
Tectonic landmass section
11
Infectious microscopic agent