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...
How Does Ph Affect Hair? Ph in Hair. The natural Ph level of human hair ranges between 4.5 and 5.5 (roughly, 5.0) and is, therefore, more acidic that water or a neutral base. The Ph scale ranges from zero to 14, with zero being the most acidic and 14 being the most alkaline.