横向
1
Force that attracts objects together
4
Unit of heredity
5
Tissue that contracts for movement
7
Positive particle in nucleus
9
Naturally occurring inorganic solid
10
Amplified beam of light
13
Measure of matter in an object
纵向
2
Chemical element in table salt
3
Our home planet
6
Reddish electrical conductor
8
Solid with repeating atomic pattern
11
Form of thermal energy
12
Unit of electric potential