横向
1
Substance with pH above 7
4
Element found in all living things
5
Reddish electrical conductor
6
Glass that splits light into spectrum
8
Smallest unit of an element
10
Nerve cell in the brain
纵向
2
Push or pull on an object
3
Molten rock beneath Earth surface
7
Our home planet
9
The Red Planet
11
Substance with pH below 7