Across
1
Second lightest element
5
Magnetic metallic element
6
Reddish electrical conductor
7
Substance with pH above 7
8
Unit of force
9
Preserved remains of ancient life
13
Naturally occurring inorganic solid
Down
1
Form of thermal energy
2
Blocking of light by a celestial body
3
Curved glass that refracts light
4
Tissue that contracts for movement
10
Particle of light
11
Chemical element in table salt
12
Disturbance that transfers energy