An environmental issue associated with in south and southeast asia includes the unnatural distribution of sediments, which may lead to flooding . a. slash-and-burn farming b. dam building c. aquaculture d. coal mining

The answer is 
B. Dam Building

The correct answer is B. dam building.
A and D don't really have much to do with flooding. Aquaculture cannot lead to the unnatural distribution of sediments. B is the correct answer because if dams are built incorrectly, they can cause many problems, such as flooding (which they are supposed to prevent), as well as problems with sediments.

C14 hope it your welcome

Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust.