Across
1
Smallest unit of an element
3
Blocking of light by a celestial body
4
Magnetic metallic element
7
Group of similar cells
8
Our home planet
11
Tissue that contracts for movement
Down
2
Molten rock beneath Earth surface
3
Biological catalyst
5
Curved glass that refracts light
6
Infectious microscopic agent
9
Basic unit of life
10
Ball of burning gas in space