Etymology of the word "Earth" | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-15

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Earth


00:02:38 1 Name and etymology
00:04:24 2 Chronology
00:04:33 2.1 Formation
00:06:05 2.2 Geological history
00:07:53 2.3 Origin of life and evolution
00:10:33 2.4 Future
00:12:40 3 Physical characteristics
00:12:50 3.1 Shape
00:14:23 3.2 Chemical composition
00:15:41 3.3 Internal structure
00:17:12 3.4 Heat
00:18:55 3.5 Tectonic plates
00:21:08 3.6 Surface
00:24:08 3.7 Hydrosphere
00:26:24 3.8 Atmosphere
00:28:45 3.8.1 Weather and climate
00:33:50 3.8.2 Upper atmosphere
00:35:40 3.9 Gravitational field
00:36:17 3.10 Magnetic field
00:37:25 3.10.1 Magnetosphere
00:38:43 4 Orbit and rotation
00:38:53 4.1 Rotation
00:40:27 4.2 Orbit
00:40:43 4.3 Axial tilt and seasons
00:43:27 5 Habitability
00:47:26 5.1 Biosphere
00:48:05 5.2 Natural resources and land use
00:49:06 5.3 Natural and environmental hazards
00:50:58 6 Human geography
00:52:15 7 Moon
00:55:41 8 Asteroids and artificial satellites
00:58:20 9 Cultural and historical viewpoint
00:59:24 10 See also
01:01:45 11 Notes



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SUMMARY
=======
Earth is the third planet from the Sun, and the only astronomical object known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over 4.5 billion years ago. 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. During this time, Earth rotates about its axis about 366.26 times.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 slows its rotation. Earth is the densest planet in the Solar System and the largest of the four terrestrial planets.Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years. About 71% of Earth's surface is covered with water, mostly by oceans. The remaining 29% is land consisting of continents and islands that together have many lakes, rivers and other sources of water that contribute to the hydrosphere. The majority of Earth's polar regions are covered in ice, including the Antarctic ice sheet and the sea ice of the Arctic ice pack. Earth's interior remains active with a solid iron inner core, a liquid outer core that generates the Earth's magnetic field, and a convecting mantle that drives plate tectonics.
Within the first billion years of Earth's history, life appeared in the oceans and began to affect the Earth's atmosphere and surface, leading to the proliferation of aerobic and anaerobic organisms. Some geological evidence indicates that life may have arisen as much as 4.1 billion years ago. Since then, the combination of Earth's distance from the Sun, physical properties, and geological history have allowed life to evolve and thrive. In the history of the Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. Over 99% of all species that ever lived on Earth are extinct. Estimates of the number of species on Earth today vary widely; most species have not been described. Over 7.6 billion humans live on Earth and depend on its biosphere and natural resources for their survival. Humans have developed diverse societies and cultures; politically, the world has about 200 sovereign states.