What are sand dunes if you answered this question first you will be marked as the brainliest and I will also follow you ! ​

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

i do believe the correct answer is the spread of chinese culture throughout asia and africa.good luck

explanation:

answer; knowledge,reason,and judgement;