横向
1
Substance with pH above 7
3
Icy body with a tail near the sun
4
Amplified beam of light
5
Tissue that contracts for movement
6
Molten rock beneath Earth surface
7
Absolute temperature scale unit
11
Force that attracts objects together
纵向
2
Second lightest element
3
Element found in all living things
8
Measure of matter in an object
9
Smallest unit of an element
10
Precious yellow metallic element
12
Group of similar cells