Across
1
Gas form of a liquid
5
Biological catalyst
7
Tissue that contracts for movement
10
Gas essential for breathing
11
Tectonic landmass section
13
Path of a planet around the sun
14
Naturally occurring inorganic solid
Down
2
Blocking of light by a celestial body
3
Absolute temperature scale unit
4
Reddish electrical conductor
6
Smallest unit of an element
8
Our home planet
9
Second lightest element
12
Nerve cell in the brain