Across
1
Our home planet
5
Biological catalyst
8
Chemical element in table salt
9
Substance with pH below 7
10
Basic unit of life
12
Force that attracts objects together
13
Glass that splits light into spectrum
Down
2
Tectonic landmass section
3
Reddish electrical conductor
4
Group of similar cells
6
Smallest unit of an element
7
The Red Planet
11
Unit of heredity