Across
1
Measure of matter in an object
2
Form of thermal energy
3
Compound containing oxygen
5
Blocking of light by a celestial body
8
Tissue that contracts for movement
11
Gas essential for breathing
Down
2
Second lightest element
4
Biological catalyst
5
Our home planet
6
Substance with pH above 7
7
Unit of energy
8
Natural satellite of Earth
9
Glass that splits light into spectrum
10
Magnetic metallic element