What is a supermajority, and what activities of the senate require it

The House may, by a simple majority vote, impeach a federal official (such as, but not limited to, the president, vice president, or a federal judge). Removal from office (and optional disqualification from any Federal, State or local office) requires a two-thirds supermajority of the Senate.

do all equestions have to be answered

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.