Across
1
Infectious microscopic agent
3
Unit of energy
7
Magnetic metallic element
8
Smallest unit of an element
9
Preserved remains of ancient life
10
Mass per unit volume
11
Group of similar cells
Down
1
Hottest planet in solar system
2
Amplified beam of light
4
The Red Planet
5
Precious yellow metallic element
6
Blocking of light by a celestial body