As the moon travels around the earth and as they, together, travel around the sun, the combined gravitational forces cause the world’s oceans to rise and fall, which is called tide. The above figure shows how tide develops. The areas of high water levels are high tides and the areas of low levels are low tides. Tides vary from day to day and also vary from place to place.

Moon data

Distance from earth: 384,199km.

Mean diameter: 3, 473km.

Mass: approx 1/81 of that of Earth

Surface gravity: 1/6 of the of Earth

Atmosphere: none, hence no clouds, no whether, no sound.

Diurnal range of temperature at the Equator:200⁰c