The Earth Vital Statistics
Size: 12,742 km (7,919
mi) in diameter.
atmosphere is composed mostly of nitrogen and oxygen. This
protective blanket slows down small meteoroids and most harmful
Surface: Continents, ocean
basins, and other products of plate tectonics dominate the
surface. Meteorite craters have been largely obliterated.
Water: Oceans cover two-thirds
of the planet's surface.