Answer:
Colorado river
Step-by-step explanation:
The Grand Canyon is usually referred to as the large and beautiful geological landform that is formed by the continuous carving of the rocks due to the flow of the Colorado River through the canyon. It is near about 450 kilometers long and has a width of about 6.5 to 30 kilometers. This canyon covers a large area in the north-western part of Arizona in the United States.
The main agent for the cutting down of rocks here is the water. According to the research, this canyon is about 70 million years old, and the river Colorado has been flowing through this canyon from about 5-6 million years back.