Across
1
Curved glass that refracts light
2
Form of thermal energy
3
Blocking of light by a celestial body
8
Solid with repeating atomic pattern
10
Tissue that contracts for movement
Down
2
Second lightest element
4
Magnetic metallic element
5
Preserved remains of ancient life
6
Mass per unit volume
7
Biological catalyst
9
Center of an atom or cell