Across
1
Icy body with a tail near the sun
4
Tissue that contracts for movement
5
Solid with repeating atomic pattern
6
Unit of electric potential
8
Molten rock beneath Earth surface
Down
2
Chemical element in table salt
3
Push or pull on an object
6
Infectious microscopic agent
7
Smallest unit of an element
9
Positive particle in nucleus
10
Measure of matter in an object
11
Basic unit of life
12
Blocking of light by a celestial body