Across
1
Basic unit of life
3
Gas essential for breathing
6
Absolute temperature scale unit
7
Glass that splits light into spectrum
8
Infectious microscopic agent
9
Center of an atom or cell
12
Icy body with a tail near the sun
Down
2
Unit of force
4
Curved glass that refracts light
5
Solid with repeating atomic pattern
7
Tectonic landmass section
10
Force that attracts objects together
11
Blocking of light by a celestial body
13
Amplified beam of light