Across
1
Element found in all living things
3
Substance with pH below 7
4
Blocking of light by a celestial body
6
Preserved remains of ancient life
9
Unit of force
10
The Red Planet
13
Second lightest element
Down
1
Solid with repeating atomic pattern
2
Smallest unit of an element
5
Amplified beam of light
7
Unit of electric potential
8
Magnetic metallic element
11
Disturbance that transfers energy
12
Ball of burning gas in space
14
Form of thermal energy