Across
1
Measure of matter in an object
3
Force that attracts objects together
6
Amplified beam of light
7
The Red Planet
8
Basic unit of life
11
Unit of heredity
Down
2
Icy body with a tail near the sun
4
Center of an atom or cell
5
Solid with repeating atomic pattern
9
Smallest unit of an element
10
Unit of electric potential
12
Glass that splits light into spectrum
13
Unit of energy