Its because of people burning fossil fuels and causing pollution.
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During Jan-June because its the dry season before hurricane season and can be very hot. (I lived in florida)
An Oasis because a gravel-covered plain would hurt there feet.A salted crusted flat is dangers if one little piece of water touches the salt could ruin the whole area.A rocky plateau they would have have to climb up and down the plateau and they could get hurt.A Oasis has pure water,and enough trees to keep most or all the air pure, and almost to no dangers animals
