Across
1
Molten rock beneath Earth surface
4
The Red Planet
8
Push or pull on an object
9
Element found in all living things
11
Blocking of light by a celestial body
Down
2
Form of thermal energy
3
Smallest unit of an element
5
Substance with pH above 7
6
Substance with pH below 7
7
Chemical element in table salt
10
Center of an atom or cell