Since 1940, the amount of fresh water used by humanity has roughly quadrupled as world population has doubled. Some water experts estimate the practical upper limit of usable renewable fresh water lies between 9,000 and 14,000 cubic kilometers yearly. That suggests a second quadrupling of world water use is unlikely.
First Quarter Moon and The Moon Phases. First Quarter Moon. The first quarter moon (often called a âhalf moonâ), happens when the moon is at a 90 degree angle with respect to the Earth and Sun. So we are seeing exactly half of the moon illuminated and half in shadow. Each lunar cycle begins with a new moon.
As the moon transitions from new to full and back to new again, it goes through several phases, marked by its recognizable crescent and gibbous (bulging) shapes, which are created by the moonâs own shadow. The moon phases are: New moon; Waxing crescent; First quarter; Waxing gibbous; Full moon; Waning Gibbous; Third quarter; Waning crescent; New moon