Across
1
Substance with pH below 7
2
Force that attracts objects together
5
Icy body with a tail near the sun
7
Positive particle in nucleus
9
Element found in all living things
10
Our home planet
Down
2
Precious yellow metallic element
3
Reddish electrical conductor
4
Unit of power
6
Unit of force
8
Magnetic metallic element
11
Form of thermal energy