Across
1
Icy body with a tail near the sun
4
Magnetic metallic element
6
Molten rock beneath Earth surface
7
Basic unit of life
10
Push or pull on an object
11
Path of a planet around the sun
Down
1
Element found in all living things
2
Measure of matter in an object
3
Form of thermal energy
5
Force that attracts objects together
8
Our home planet
9
Naturally occurring inorganic solid
12
Positive particle in nucleus