Question

question 1
what is the length of time the grand canyon has been getting carved?
○ 3 billion years
○ 2 million years
○ 1 billion years
○ 2 billion years

Explanation:

The Grand Canyon's carving (by the Colorado River and other geological processes) has been occurring for about 2 million years. The other options (3 billion, 1 billion, 2 billion years) are incorrect as the canyon's active carving phase is around 2 million years, while the rock layers are older (up to ~2 billion years, but that's not the carving time).

Answer:

B. 2 million years