1)
Here it says that each was three Amos tall. Above (Melachim I, 7:16) it says that it was five Amos!
1.
Refer to Melachim I, 7:16:4:1-2.
2)
What is "Sevachah"?
1.
Refer to Melachim I, 7:17:1:1-2.