7 Unknown facts about EARTH

1==> The Earth's average distance from the Sun is 149,597,890 km (92,955,820 miles) or one astronomical unit (AU). Located between Venus and Mars, some people have called it the "third rock from the sun. .

2==> The earliest material found in the Solar System is dated to 4.5672±0.0006 billion years ago.

3==> Although scholars estimate that over 99 percent of all species of life (over five billion) that ever lived on Earth are extinct there are still an estimated 10–14 million extant species of which about 1.2 million have been documented and over 86 percent have not yet been described.

4==> Over 7.3 billion humans live on Earth and depend on its biosphere and minerals for their survival. Earth's human population is divided among about two hundred sovereign states which interact through diplomacy, conflict, travel, trade and communication media.

5==> Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years.

6==> Seventy-one percent of Earth's surface is covered with water with the remainder consisting of continents and islands that together have many lakes and other sources of water that contribute to the hydrosphere.

7==> The process that led to the formation of the Moon approximately 4.53 Gya ago is the subject of ongoing research. The working hypothesis is that it formed by accretion from material loosed from Earth after a Mars-sized object, named Theia, impacted with Earth.