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...
It is this mixture which will determine what color your hair actually is. Simply put, the amount of melanin in your hair determines your hair color. People with dark hair have more melanin than people with light hair. If your hair is black, your body produces more melanin than someone with brown hair. If your hair color is blond, you have less melanin than a person with brown hair.