EARTH IS THE ONLY ASTRONOMICAL OBJECT KNOWN TO HARBOR LIFE. EARTH´S GRAVITY INTERACTS WITH OTHER OBJECTS IN SPACE, ESPECIALLY THE SUN AND THE MOON, EARTH´S ONLY NATURAL SATELLITE. EARTH REVOLVES AROUND THE SUN IN 365,26 DAYS, A PERIOD KNOWN AS AN EARTH YEAR. THE TOTAL SURFACE AREA OF EARTH IS ABOUT 510 MILLION KM2, OF THIS 70,8 % IS BELOW SEA LEVEL AND COVERED BY OCEAN WATER. EARTH´S AXIS OF ROTATION IS TILTED WITH RESPECT TO ITS ORBITAL PLANE, PRODUCING SEASONS ON EARTH. THE GRAVITATIONAL INTERACTION BETWEEN EARTH AND THE MOON CAUSES OCEAN TIDES, STABILIZES EARTH´S ORIENTATION ON ITS AXIS, AND GRADUALLY SLOWSITS ROTATION. EARTH IS THE DENSEST PLANET IN THE SOLAR SYSTEM AND THE LARGEST OF THE FOUR TERRESTRIAL PLANETS.
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