4 questions, each answered from published authorities with the sources listed.
Photo by Hp.Baumeler, via Wikimedia Commons, CC BY-SA 4.0. Source: https://commons.wikimedia.org/wiki/File:Aerial_photograph_Sossusvlei.jpg. License: https://creativecommons.org/licenses/by-sa/4.0/AuthorHp.Baumeler · CC BY-SA 4.0File source