Karan Nakra's Official Blog

Geologists place the age of the Earth at around 4.5 billion years. Grand Canyon Facts reveal that the oldest rock in the Inner Gorge is nearly 2 billion years old! The limestone that caps the rim of the Grand Canyon is a young 270 million years. The oldest human artifacts date back 12,000 years.

Can you imagine the persistence of the Colorado River to cut a canyon that is 4,000 feet deep for 277 miles, and digs down to 6,000 feet at its deepest and 15 miles at its widest? That's some river! It's hard to imagine how the Grand Canyon was formed by flowing water.

The Grand Canyon Sky Walk opened in March 2007. According to Grand Canyon Facts, it is an amazing feat of architecture, allowing you the feeling of floating over the depths as you look down through the glass-bottomed loop.

# Over 1,500 plant, 355 bird, 89 mammalian, 47 reptile, 9 amphibian, and 17 fish species are found in the park.