Across
1
Tissue that contracts for movement
4
Second lightest element
5
Biological catalyst
6
Push or pull on an object
7
Substance with pH below 7
8
Smallest unit of an element
11
Tectonic landmass section
13
Positive particle in nucleus
Down
1
Molten rock beneath Earth surface
2
Disturbance that transfers energy
3
Center of an atom or cell
9
Our home planet
10
Magnetic metallic element
12
Measure of matter in an object
14
Fourth state of matter