Answer:
Dense water sinks below less dense water. This is the principle that drives the deep ocean currents that circulate around the world. A combination of high salinity and low temperature near the surface makes seawater dense enough to sink into the deep ocean and flow along the bottom of the basins.
Yes, this is true:
Equator runs through the northern part of Lake Victoria (which is on the border between Kenya, Uganda and Tanzania). Specifically, it passes through some islands (the Ssese Islands, some of which are inhabited) on Lake Victoria that belong to Uganda.
Pull factors are reasons why groups of people leave a particular place.