Across
1
Our home planet
3
Reddish electrical conductor
4
Substance with pH above 7
5
Gas essential for breathing
10
Chemical element in table salt
11
Smallest unit of an element
Down
2
Naturally occurring inorganic solid
3
Icy body with a tail near the sun
6
Force that attracts objects together
7
Second lightest element
8
Element found in all living things
9
Hottest planet in solar system