Question

how does people get know that sahara was once used to be ash green plain​

Answer 1

Answer:

About 11,000 years ago, the desert turned green. Grass grew on the dunes, lakes filled dry depressions, grassland animals moved in, and people followed. It was the most recent African Humid Period, or Green Sahara.

Answer 2

Explanation:

1. Today, the Sahara Desert is defined by undulating sand dunes, unforgiving sun, and oppressive heat. But just 10,000 years ago, it was lush and verdant. So, what spurred the shift from woodland to wasteland
2. A new study suggests humans played a big role. Author David Wright, an environmental archeologist at Seoul National University, says that as humans spread west from the Nile river 8,000 years ago, they brought with them sheep, cows, and goats that gobbled up, mowed down, and trampled over native vegetation. This transformed the landscape and altered the local climate
3. Today the Sahara is the largest hot desert in the world. Ten thousand years ago, it looked more like the African savanna, seen here.
4. Goats are the prime suspects," said Wright. "I've literally seen a goat eat a brick — they aren't picky eaters at all, and they eat a lot for their size. It wouldn't take many goats on a stressed out landscape to make a pretty big impact."
5. If hungry, plant-eating mammals already dotted the Sahara, why did domesticated animals play such a transformative role? The answer is that wild animals don't like to spend a lot of time out in the open