NOVA SpaceNow 2015: The Deepest Place On Earth || New Science Documentary || FULL LENGTH HD

NOVA SpaceNow 2015: The Deepest Place On Earth || New Science Documentary || FULL LENGTH HD

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Earth, also called the world and, less frequently, Gaia (and Terra in some works of science fiction) is the third planet from the Sun, the densest planet in the Solar System, the
largest of the Solar System's four terrestrial planets, and the only astronomical object known to accommodate life. The earliest life on Earth arose at least 3.5 billion years ago. Earth's
biodiversity has expanded continually except when interrupted by mass extinctions.[31] Although scholars estimate that over 99 percent of all species, amounting to over five billion species, that
ever lived on the planet are extinct, Earth is currently home to 10–14 million species of life, of which about 1.2 million have been documented and over 86 percent have not yet
been described. Over 7.3 billion humans depend upon its biosphere and minerals. Earth's human population is divided among about two hundred sovereign states which interact through
diplomacy, conflict, travel, trade and communication media. According to evidence from radiometric dating and other sources, Earth was formed about 4.54 billion years ago. Within its first billion years, life appeared in its oceans and
began to affect its atmosphere and surface, promoting the proliferation of aerobic as well as anaerobic organisms and causing the formation of the atmosphere's ozone layer. This layer and the
geomagnetic field blocked the most life-threatening parts of the Sun's radiation, so life was able to flourish on land as well as in water. Since then, the combination of Earth's distance
from the Sun, its physical properties and its geological history have allowed life to thrive and evolve. Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years. 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. Earth's poles are mostly covered
with ice that includes the solid ice of the Antarctic ice sheet and the sea ice of the polar ice packs. Earth's interior remains active with a solid iron inner core, a liquid outer core that
generates the magnetic field, and a thick layer of relatively solid mantle. Earth gravitationally interacts with other objects in space, especially the Sun and the Moon. During one orbit around the Sun, Earth rotates about its own axis 366.26 times, creating 365.26 solar
days or one sidereal year.[n 6] Earth's axis of rotation is tilted 23.4° away from the perpendicular of its orbital plane, producing seasonal variations on the planet's surface with a period of
one tropical year (365.24 solar days).[45] The Moon is Earth's only natural satellite. It began orbiting Earth about 4.53 billion years ago. The Moon's gravitational interaction with Earth
stimulates ocean tides, stabilizes the axial tilt and gradually slows the planet's rotation.
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