Across
1
Substance with pH above 7
4
Magnetic metallic element
5
Second lightest element
6
Icy body with a tail near the sun
7
Tectonic landmass section
Down
2
Unit of power
3
Naturally occurring inorganic solid
7
Particle of light
8
Unit of energy
9
Push or pull on an object
10
Curved glass that refracts light
11
Smallest unit of an element