将一段英语文本转化为一段适合小学生阅读的英语文本。
英语原文：The Grand Canyon is a steep-sided canyon carved by the Colorado River in Arizona, United States. The Grand Canyon is 277 miles long, up to 18 miles wide, and over a mile deep.
The Grand Canyon is a very big hole in the ground. It was made by a river called the Colorado River in a state called Arizona, in the United States. The Grand Canyon is 277 miles long, up to 18 miles wide, and over a mile deep.