<span>trucks drive on them while they are frozen...</span>
The French is the correct answer.
Answer:
Explanation: A dune is a mound of sand formed by the wind, usually along the beach or in a desert. Dunes form when wind blows sand into a sheltered area behind an obstacle. Dunes grow as grains of sand accumulate. Every dune has a windward side and a slipface.
Russia, Kazakhstan, Turkmenistan, Iran and Azerbaijan all border the Caspian Sea.
