What is the process by which the movement of sand dunes occurs

Wind carries sand up the windward side of the dune and drops it over onto the leeward side. I hope this helps.

fire could start, buildings collapsing, and ash falling from the sky.

explanation:

this is because the buildings or plants could catch on fire and the buildings would most likely collapse. lastly ash would fall because all the burning would cause ash to fall from the sky.

hope this .