Across
1
Basic unit of life
4
Solid with repeating atomic pattern
5
Gas essential for breathing
9
Absolute temperature scale unit
10
Path of a planet around the sun
12
Our home planet
Down
2
Unit of force
3
Blocking of light by a celestial body
6
Substance with pH below 7
7
Unit of energy
8
Mass per unit volume
11
Naturally occurring inorganic solid