Thousands of years ago, the Sahara Desert was a very different place. Scientists bel that mu of t region w covered wi grass, la, and riv. Ancient ro paintings fo there sh people herding cattle and hunting animals that need water to survive, such as hippos. About five thousand years ago, small changes in the Earth's orbit reduced the amount of rain that fell in North Africa, and the land slowly dried out.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.