Across
1
Icy body with a tail near the sun
3
Amplified beam of light
4
Hottest planet in solar system
7
Natural satellite of Earth
9
Tectonic landmass section
11
Unit of heredity
Down
2
Second lightest element
4
Unit of electric potential
5
Absolute temperature scale unit
6
Gas essential for breathing
7
Naturally occurring inorganic solid
8
Blocking of light by a celestial body
10
Tissue that contracts for movement