Across
1
Force that attracts objects together
4
Magnetic metallic element
5
Icy body with a tail near the sun
7
Substance with pH above 7
10
Hottest planet in solar system
11
Chemical element in table salt
13
Smallest unit of an element
Down
2
Our home planet
3
Ball of burning gas in space
6
Tissue that contracts for movement
8
Tectonic landmass section
9
Path of a planet around the sun
12
Push or pull on an object