The genocide happened in Rwanda, you are correct.
Rip currents are mainly caused when the sea is rough and large waves break into the shore. the water from the previous large wave tries to find a weak spot in the incoming wave and when it finds it, the water quickly pulls away from the shore causing dangerous rip currents. This type of currents have caused numerous deaths.
Quicksand is mainly water and sand so it makes sense that it eventually leads to a water source underground.
Http://skywalker.cochise.edu/wellerr/students/measure-quake/paper.htm go here and all the answers are there
