Answer:

The largest non polar desert is the sahara desert. A coastal desert lies on the coast next to cold ocean currents. And no, I do not agree with the statement: "all deserts have sand."

Explanation:

The Sahara desert is a desert found in Africa. Coastal deserts occur in places that are in between cool and warm temperatures along the coast, having cool winters and warm summers. An example of this is the Atlantic coastal desert, or the Désert côtier atlantique in the Sahara desert. Surprisingly, not all deserts have sand. In fact, only 20% of the world's deserts do have sand. Three types of deserts with little to no sand are tundras, arctic, and alpine.

I hope this helps, and I hope you have a great day!