Across
1
Nerve cell in the brain
4
Magnetic metallic element
5
Tissue that contracts for movement
6
Solid with repeating atomic pattern
11
Group of similar cells
12
Blocking of light by a celestial body
14
Our home planet
15
Infectious microscopic agent
Down
2
Reddish electrical conductor
3
Preserved remains of ancient life
7
Naturally occurring inorganic solid
8
Chemical element in table salt
9
Center of an atom or cell
10
Ball of burning gas in space
13
Mass per unit volume