Across
1
Second lightest element
3
Solid with repeating atomic pattern
4
Unit of heredity
8
Path of a planet around the sun
9
Absolute temperature scale unit
12
Molten rock beneath Earth surface
Down
2
Basic unit of life
3
Reddish electrical conductor
5
Infectious microscopic agent
6
Naturally occurring inorganic solid
7
Form of thermal energy
10
Unit of power
11
Curved glass that refracts light
13
Magnetic metallic element