25% of Africa are deserts!
I hope this helps;)
Just a brief history of the Illiad:
This story is all about how Ilium, otherwise known as Troy, fell. It is a Greek poem attributed to Homer. The story is set during the Trojan war near the end of it. it all started when Paris, stole Helen from Menelaus who is the King of Troy.
Attached is the re-typed summary and the answers to your questions. I hope this helps.
Answer:
Erosion breaks existing rocks and turns them into sediments. The sediments can be formed into rocks by the chemical reactions of dissolved seashells ( Calcium Carbonate.) This reaction can form sediments into rocks very quickly like the formation of concrete ( same chemical reaction). Erosion only happens on the earth's surface.
As erosion only happens on the earth's surface, sedimentary rocks are only formed on the earth's surface.
In other words:
Sedimentary rocks only found on or close to Earth's surface because sedimentary rocks are made of materials deposited in layers at the Earth's surface.