how did the climate or geography of north africa change between 10,000 b.c. and 1000 b.c.? responses the climate cooled and many tropical areas experienced freezing temperatures for the first time the climate cooled and many tropical areas experienced freezing temperatures for the first time rainfall gradually increased and desert areas eventually became rain forests rainfall gradually increased and desert areas eventually became rain forests volcanic activity turned much of the area into lava fields where few life-forms could survive volcanic activity turned much of the area into lava fields where few life-forms could survive rainfall gradually diminished and areas that were once grassy and forested became deserts