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.
half-moon - the time at which the Moon is at first or last quarter when half its face is illuminated. month - a time unit of approximately 30 days; he was given a month to pay the bill. phase of the moon - a time when the Moon presents a particular recurring appearance. first quarter - the first fourth of the Moon's period of revolution around the Earth.