横向
1
Force that attracts objects together
3
Natural satellite of Earth
5
Compound containing oxygen
6
Fourth state of matter
9
Hottest planet in solar system
10
Tissue that contracts for movement
12
Reddish electrical conductor
纵向
2
Gas essential for breathing
4
Unit of electric potential
5
Path of a planet around the sun
7
The Red Planet
8
Glass that splits light into spectrum
11
Icy body with a tail near the sun