Across
1
Tissue that contracts for movement
4
Disturbance that transfers energy
6
Substance with pH below 7
7
Unit of heredity
9
Positive particle in nucleus
10
Blocking of light by a celestial body
Down
2
Form of thermal energy
3
Reddish electrical conductor
5
Tectonic landmass section
7
Precious yellow metallic element
8
Hottest planet in solar system
11
Magnetic metallic element
12
Nerve cell in the brain