Question

is intervening opportunity a type of migration

Answer 1

No.

http://en.wikipedia.org/wiki/Theory_of_intervening_opportunities

Answer 2

What are 8 types of migration?
I got Chain Migration, Forced, Global Scale, Internal, International, Step, and Voluntary
I need 1 more

Answer 3

http://www.nationalgeographic.com/xpeditions/lessons/09/g68/migrationguidestudent.pdf