Across
1
Second lightest element
4
Unit of heredity
5
Ball of burning gas in space
9
Chemical element in table salt
10
Measure of matter in an object
11
Molten rock beneath Earth surface
Down
2
Naturally occurring inorganic solid
3
The Red Planet
4
Force that attracts objects together
6
Our home planet
7
Substance with pH above 7
8
Biological catalyst