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☆☆☆☆☆Earth's Precession
One reason that the prehistoric period was called the stone age is because stone was the main tool available that was used to make things. Stones would be used to make tools and weapons and other things by the people at the time.
The ability to smelt metal had not yet been discovered and so the tools had to be made from stone.
Egypt
Egypt needed Nubian's natural resources Egypt needed Nubian gold Egypt needed help fighting off invaders.
The period of time prior to the invention of writing is referred to as "Prehistory". This division of time is also noted by the use of a written calendar and the days before there were such dates notated.
eutrophication
He reduced problems with the Yellow River.
humidity
the river sat abouve the surrounding countryside<======
A rotating updraft, or supercell
the Egyptians -apex
