Across
1
Disturbance that transfers energy
4
Center of an atom or cell
6
Force that attracts objects together
7
Unit of heredity
9
The Red Planet
11
Icy body with a tail near the sun
Down
2
Form of thermal energy
3
Biological catalyst
5
Ball of burning gas in space
8
Tectonic landmass section
10
Unit of power
12
Unit of electric potential