Under the ocean, sand can be found in many forms.
By the shore, the sea grinds up rocks over thousands or millions of years, making sand.
Sand can also be made from rivers and other elements.
On land, sand is made from rocks, ground down by weathering.
An area covered in sand is the Sahara desert, but not all of it; there are plenty of surprises under the sand.
The Sahara wasn’t always as dry as it is now, says the narrator.
There are prehistoric mega-lakes near the Nile River that could have supported human settlements close to a water source.
As inhospitable as the Sahara may seem, it has been lived in through the centuries, with settlements and fortresses from lost civilizations being discovered throughout the years.
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