Diamonds, gold, kaolin, gypsum, tin, and various gemstones, including tanzanite, are mined in Tanzania. Gold is an important resource and the country's most valuable export. There are large exploitable deposits of coal in the southwest, phosphate deposits in Arusha, and nickel in the Kagera region.
Assuming this involves another form of shifting tectonic plates, the answer would be earthquakes. Another form of the question is asking for continental drift.
Glacial ice can transport rocks as big as a house. It has very high transport competence and moves very slowly across a very large distance.
The maximum size of particles that a stream can transport is defined as stream competence. This is a concept under hydrology. Streams depending on its velocity can carry sand, mud, silt and cobble along with the dissolved and suspended load.
The process by which Ocean waves transport sediments, large pebbles and boulders is referred to as Coastal Transportation. During Coastal transportation, large pebbles and boulders are rolled along the seabottom, while beach material is bounced along the seabed.
