Darker skin tends to be more acne-prone because it has larger sebaceous glands that produce more oil. Those with darker skin are more likely to experience post-inflammatory hyperpigmentation (PIH), dark spots that linger for weeks or months after acne has healed, caused by the overproduction of melanin.
If the hole had reached the initial goal of 15,000 meters, temperatures would have reached a projected 300Â°C (572Â°F). When drilling stopped in 1994, the hole was over seven miles deep (12,262 meters), making it by far the deepest hole ever drilled by humankind. The last of the cores to be plucked from from the borehole were dated to be about 2.7 billion years old, or roughly 21 million times older than Coca Cola.
The deeper the well, the less gallons per minute are needed because the 6â³ diameter well acts as a reservoir. The deeper the well, the more water it will hold. Each foot of the well will hold 1.33 gallons of water. Therefore, 2 gpm is sufficient for a 600â² well but not for a 200â² well where 8 gpm would be needed.