Across
1
Blocking of light by a celestial body
5
Measure of matter in an object
6
Molten rock beneath Earth surface
8
Icy body with a tail near the sun
11
Unit of heredity
12
Substance with pH above 7
14
Hottest planet in solar system
15
Magnetic metallic element
Down
2
Solid with repeating atomic pattern
3
Center of an atom or cell
4
Fourth state of matter
7
Push or pull on an object
9
Our home planet
10
Tissue that contracts for movement
13
Basic unit of life