Across
1
Tectonic landmass section
4
Molten rock beneath Earth surface
5
Center of an atom or cell
6
Path of a planet around the sun
11
Mass per unit volume
12
Basic unit of life
13
Chemical element in table salt
14
Glass that splits light into spectrum
Down
1
Particle of light
2
Ball of burning gas in space
3
Biological catalyst
7
Measure of matter in an object
8
The Red Planet
9
Unit of heredity
10
Blocking of light by a celestial body