Sahara desert, camels were best suited for this trail because of their ability to store water in their humps.
They are all connected. You need an education so you can become employed in a career and then you make an income from that career.
When you heat air it expands. When air expands it becomes less dense than the air around it, in turn making it rise.
Hope that helped
C. president roosevelt's "four freedoms" speech
