Across
1
Our home planet
3
Molten rock beneath Earth surface
4
Icy body with a tail near the sun
6
Ball of burning gas in space
7
Blocking of light by a celestial body
8
Tectonic landmass section
9
Positive particle in nucleus
10
Basic unit of life
11
Substance with pH below 7
Down
2
Force that attracts objects together
5
Naturally occurring inorganic solid
8
Glass that splits light into spectrum
12
Mass per unit volume
13
Infectious microscopic agent
14
Amplified beam of light