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
East of the Sun and West of the Moon some candles, and tells her to light them at night, to see what is sharing her bed. The youngest daughter obeys, and finds he is a highly attractive prince, but she spills three drops of the melted tallow on him, waking him. He tells her that if she held out a year, he would have been free, but now he must go to his wicked stepmother, who enchanted him into this shape and lives in a castle east of the sun and west of the moon, and marry her hideous daughter, a troll princess. In the morning, the youngest daughter