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Where would you find a tropical rainforest Brazil or Egypt?
from Answers.com
Brazil, you need to use common sense. Rain forests grow in hot areas near the equator that have no dry season. Egypt is always dry so that can't be it but Brazil is near the equator and barely ever is dry so Brazil must be the answer.
It is in fact a fact that the area was a rain forest at one time, it was about 10,000 - 12,000 years ago....
the wind currents changed and dried the area out..
“Lecture 6 - Ancient Egypt c. 3100-1069 BC
SECTIONS: climate, chronology, political organization, religion, world empire
Developments in the Nile Valley of Egypt took a different form than those in Mesopotamia. During the final stages of the Pleistocene era (the Younger Dryas, 16000-11000 BC), the region now occupied by the Sahara Desert furnished a lush rain forest to sustain scattered human settlement. With gradual global warming the Sahara Desert came into being. Widespread desiccation caused human occupants of the Sahara to follow their food sources to the north African coast as well as to the narrow basin of the Nile. A vast, lifeless desert closed them off from the east, similarly barren mountains from the west, the narrow gorges, desert borders, and complicated watersheds of the Nile itself from the south and the deep waters of the Mediterranean Sea to the north. The formidable nature of these barriers caused the Egyptian population to remain highly isolated, secure in one respect from the threat of outside invasion but technologically backward and slow to change in another. Evidence suggests that they had adapted to animal husbandry by 8000 BC and agriculture by 5000; however, they did not acquire bronze technology until 2000 BC. The inhabitants along the extremely narrow basin of the Nile forged one of the earliest and greatest world empires – the united “kingdoms” of ancient Egypt.”
from an article a the link...