Microorganisms causing diseases that characteristically are waterborne prominently include protozoa and bacteria, many of which are intestinal parasites, or invade the tissues or circulatory system through walls of the digestive tract. Various other waterborne diseases are caused by viruses.
As the Moon revolves around Earth, both objects also progress in orbit around the Sun. After completing one revolution with respect to the stars, the Moon must continue a little farther along its orbit to catch up to the same position it started from relative to the Sun and Earth.
The way that the moon looks changes during the month. We say that the phases of the moon are a cycle in nature. The Earth has 1 moon that revolves around the Earth. It is a satellite of Earth. It takes 29 Â½ days â almost 1 month â for the moon to move (revolve) around the Earth. The moon does not make any light of its own. The lighted parts that we see are called phases.