What kind of rock is found at the lowest level of the Grand Canyon?

Elves Chasm gneiss

More than 1 billion years ago: The foundations are laid

Under extreme heat and pressure, their rocks transformed into the dark-colored “basement” rocks seen near the bottom of the canyon today — including 1.84-billion-year-old rocks called the Elves Chasm gneiss, the oldest known in the canyon.

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Explanation:

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.