1) The Grand Canyon, located in Arizona, United States, is a massive and awe-inspiring natural formation carved by the Colorado River. It is approximately 446 kilometers (277 miles) long, up to 29 kilometers (18 miles) wide, and reaches a depth of over 1.8 kilometers (1.1 miles).

2) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.

3) The strongest natural material known to man is spider silk. It is stronger than steel and more flexible than nylon.

4) The human body contains enough carbon to make over 9,000 pencils.