Across
1
Fourth state of matter
4
Naturally occurring inorganic solid
8
Substance with pH above 7
9
Path of a planet around the sun
11
Basic unit of life
12
Push or pull on an object
13
Reddish electrical conductor
Down
2
Disturbance that transfers energy
3
Substance with pH below 7
5
Our home planet
6
Blocking of light by a celestial body
7
Tectonic landmass section
10
Force that attracts objects together
14
Smallest unit of an element