Across
1
Tissue that contracts for movement
3
Form of thermal energy
6
Element found in all living things
7
Substance with pH above 7
10
Hottest planet in solar system
11
Path of a planet around the sun
14
Ball of burning gas in space
Down
2
Disturbance that transfers energy
4
Reddish electrical conductor
5
Chemical element in table salt
8
Gas essential for breathing
9
Molten rock beneath Earth surface
12
Natural satellite of Earth
13
Center of an atom or cell