横向
1
Force that attracts objects together
3
Blocking of light by a celestial body
4
Mass per unit volume
7
Substance with pH below 7
纵向
2
Unit of force
5
Our home planet
6
Reddish electrical conductor
8
Second lightest element
Force that attracts objects together
Blocking of light by a celestial body
Mass per unit volume
Substance with pH below 7
Unit of force
Our home planet
Reddish electrical conductor
Second lightest element