Across
1
Blocking of light by a celestial body
5
Tissue that contracts for movement
7
Element found in all living things
8
Glass that splits light into spectrum
9
Gas essential for breathing
11
The Red Planet
Down
2
Magnetic metallic element
3
Nerve cell in the brain
4
Unit of energy
6
Solid with repeating atomic pattern
10
Substance with pH above 7
12
Precious yellow metallic element
13
Force that attracts objects together