Across
1
Biological catalyst
4
Icy body with a tail near the sun
6
Chemical element in table salt
8
Our home planet
9
Absolute temperature scale unit
10
Unit of heredity
Down
2
Gas essential for breathing
3
Tectonic landmass section
5
Push or pull on an object
7
Molten rock beneath Earth surface
11
Path of a planet around the sun