Across
1
Positive particle in nucleus
6
Solid with repeating atomic pattern
7
Tectonic landmass section
9
Particle of light
10
Substance with pH above 7
13
Group of similar cells
14
Unit of force
Down
2
Hottest planet in solar system
3
Blocking of light by a celestial body
4
Gas essential for breathing
5
Unit of power
8
Force that attracts objects together
9
Glass that splits light into spectrum
11
Form of thermal energy
12
Unit of energy