Geophysics to every area of the Earth sciences. To provide a clearer idea of what constitutes geophysics, this section describes phenomena that are studied in physics and how they relate to the Earth and its surroundings. The gravitational pull of the Moon and Sun give rise to two high tides and two low tides every lunar day, or every 24 hours and 50 minutes. Therefore, there is a gap of 12 hours and 25 minutes between every high tide and between every low tide. Gravitational forces make rocks press down on deeper rocks, increasing their density as the depth increases. Measurements
Partial/total eclipses on the Moon Partial/total eclipses on the Moon Partial/total Solar eclipses on the Moon are caused when the Earth passes in front of the Sun, blocking a part its light in one part and the whole light in the other. Viewers on Earth will see a partial lunar eclipse. During its eclipses, the Earth will be in new phase, completely dark, except for moonshine and sunlight refracted through the earth's atmosphere, visible as a ring of light. The next partial-total solar eclipse on the Moon will be partial-total on August 7, 2017 with the southern portion of the Southern Hemisphere seeing totality. Seen