Across
1
Blocking of light by a celestial body
2
Molten rock beneath Earth surface
4
Magnetic metallic element
7
Absolute temperature scale unit
8
Unit of electric potential
9
Preserved remains of ancient life
12
Glass that splits light into spectrum
13
Disturbance that transfers energy
Down
1
Our home planet
3
Mass per unit volume
5
Unit of heredity
6
Chemical element in table salt
10
Group of similar cells
11
Gas essential for breathing