Earth - Revision history

Protik Sikder at 05:19, 9 January 2025

2025-01-09T05:19:56Z

← Older revision		Revision as of 11:19, 9 January 2025
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			{{SHORTDESC: Planet}}
	[[File:The Earth seen from Apollo 17.jpg\|thumb\|170px\|A color image of Earth from Apollo 17, showing [[Africa]], [[Antarctica]], and the [[Indian Ocean]].]]		[[File:The Earth seen from Apollo 17.jpg\|thumb\|170px\|A color image of Earth from Apollo 17, showing [[Africa]], [[Antarctica]], and the [[Indian Ocean]].]]
	'''Earth''' is the third planet from the [[Sun]] in the [[Solar System]] and the only known celestial body to support life. It has a dense [[atmosphere]] composed primarily of [[nitrogen]] and [[oxygen]]. About 71% of Earth's surface is covered by [[ocean]]s, giving it a predominant [[blue]] appearance. Scientists estimate that Earth formed approximately {{formatnum:4600}} million years ago.		'''Earth''' is the third planet from the [[Sun]] in the [[Solar System]] and the only known celestial body to support life. It has a dense [[atmosphere]] composed primarily of [[nitrogen]] and [[oxygen]]. About 71% of Earth's surface is covered by [[ocean]]s, giving it a predominant [[blue]] appearance. Scientists estimate that Earth formed approximately {{formatnum:4600}} million years ago.

Blossom at 05:09, 9 January 2025

2025-01-09T05:09:40Z

← Older revision		Revision as of 11:09, 9 January 2025
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	~~== Earth ==~~

	[[File:The Earth seen from Apollo 17.jpg\|thumb\|170px\|A color image of Earth from Apollo 17, showing [[Africa]], [[Antarctica]], and the [[Indian Ocean]].]]		[[File:The Earth seen from Apollo 17.jpg\|thumb\|170px\|A color image of Earth from Apollo 17, showing [[Africa]], [[Antarctica]], and the [[Indian Ocean]].]]

	'''Earth''' is the third planet from the [[Sun]] in the [[Solar System]] and the only known celestial body to support life. It has a dense [[atmosphere]] composed primarily of [[nitrogen]] and [[oxygen]]. About 71% of Earth's surface is covered by [[ocean]]s, giving it a predominant [[blue]] appearance. Scientists estimate that Earth formed approximately {{formatnum:4600}} million years ago.		'''Earth''' is the third planet from the [[Sun]] in the [[Solar System]] and the only known celestial body to support life. It has a dense [[atmosphere]] composed primarily of [[nitrogen]] and [[oxygen]]. About 71% of Earth's surface is covered by [[ocean]]s, giving it a predominant [[blue]] appearance. Scientists estimate that Earth formed approximately {{formatnum:4600}} million years ago.

Blossom: Created page with "== Earth == A color image of Earth from Apollo 17, showing [[Africa, Antarctica, and the Indian Ocean.]] '''Earth''' is the third planet from the Sun in the Solar System and the only known celestial body to support life. It has a dense atmosphere composed primarily of nitrogen and oxygen. About 71% of Earth's surface is covered by oceans, giving it a predominant blue appearance...."

2025-01-09T05:09:20Z

Created page with "== Earth == thumb|170px|A color image of Earth from Apollo 17, showing [[Africa, Antarctica, and the Indian Ocean.]] '''Earth''' is the third planet from the Sun in the Solar System and the only known celestial body to support life. It has a dense atmosphere composed primarily of nitrogen and oxygen. About 71% of Earth's surface is covered by oceans, giving it a predominant blue appearance...."

New page

== Earth ==

[[File:The Earth seen from Apollo 17.jpg|thumb|170px|A color image of Earth from Apollo 17, showing [[Africa]], [[Antarctica]], and the [[Indian Ocean]].]]

'''Earth''' is the third planet from the [[Sun]] in the [[Solar System]] and the only known celestial body to support life. It has a dense [[atmosphere]] composed primarily of [[nitrogen]] and [[oxygen]]. About 71% of Earth's surface is covered by [[ocean]]s, giving it a predominant [[blue]] appearance. Scientists estimate that Earth formed approximately {{formatnum:4600}} million years ago.

== Description ==

Earth orbits the Sun between [[Venus (planet)|Venus]] and [[Mars (planet)|Mars]] at an average distance of 149.6 million kilometers (1 astronomical unit). Its single natural satellite, the [[Moon]], significantly influences Earth's tides and stabilizes its axial tilt. Earth has an [[equator|equatorial]] diameter of {{formatnum:12756}} kilometers.

== Structure ==

The interior of Earth is divided into five distinct layers:
* '''[[Inner core]]''': A solid metallic sphere primarily composed of iron and nickel.
* '''[[Outer core]]''': A liquid layer also composed of iron and nickel.
* '''[[Mantle]]''': A viscous layer of silicate materials.
* '''[[Asthenosphere]]''': The upper part of the mantle, partially molten and ductile.
* '''[[Crust]]''': The outermost layer, consisting of two types:
* '''[[Oceanic crust]]'''
* '''[[Continental crust]]'''

Above the crust lies the [[atmosphere]], which becomes less dense with increasing altitude.

== Movements ==

=== Rotational and Orbital Motions ===
Earth exhibits two main motions: rotation and revolution.
* '''Rotation''': Earth rotates around its axis once every 24 hours, resulting in the cycle of day and night.
* '''Revolution''': Earth orbits the Sun in an elliptical path, completing one revolution in approximately 365.25 days. The additional 0.25 days lead to a [[leap year]] every four years.

=== Long-Term Motions ===
Earth also undergoes long-term motions over millennia:
* '''Precession''': A slow conical motion of Earth's axis caused by gravitational forces from the Sun and the Moon.
* '''Nutation''': Small oscillations of Earth's axis with a period of approximately 18 years, primarily due to the Moon's gravitational influence.

=== Internal Motions ===
[[File:Convection.gif|thumb|Illustration of convection currents.]]
Internal motions within Earth, such as convection currents in the mantle, drive the movement of heat and energy. This process involves:
* Cooler, denser material sinking.
* Heating near the core, causing material to rise.
* Continuous cycling of material, which drives plate tectonics.
== The Moon ==
Earth has one natural satellite, the [[Moon]], which influences tides, stabilizes Earth's axial tilt, and contributes to the planet's dynamic evolution.
== References ==
[[Category:Planets]]
[[Category:Solar System]]