Across
1
Measure of matter in an object
3
Force that attracts objects together
4
Unit of force
6
Second lightest element
7
Tectonic landmass section
12
Preserved remains of ancient life
Down
2
Biological catalyst
5
Group of similar cells
8
Absolute temperature scale unit
9
Path of a planet around the sun
10
Unit of electric potential
11
Substance with pH below 7
13
Fourth state of matter