The United States Geological Survey estimates that (as of 2005, the most recent year for which data is available) we withdraw 410 billion gallons of water a day, including both fresh and saline water. Most (80%) of these withdrawals go to thermoelectric power plants (for cooling) and agriculture (for watering crops).
Level 4 is the hair color level that is represented as dark brown. It is one of the most common natural hair colors and also very commonly found in hair dye. Level 4 is also common in red or...
Some hair is dark, some is white and some hair is completely white or gray. Hair color is dependent on the pigment in the cortex that forms the main horny portion of the hair. Gray or white is simply hair without pigment. This same chemical pigment is what determines our skin color.