The Earth

The Earth is a solar planet that is the third planet from The Sun.

• AKA: Terra, 𐎘𐎔𐎼𐎠𐎼𐎦.
• Context:
  • It can typically orbit The Sun in an elliptical path with a 365.25-day period.
  • It can typically maintain Earth's atmosphere which creates habitable conditions for terrestrial life.
  • It can typically have Earth's magnetic field which protects against solar radiation.
  • It can typically support a biosphere that contains diverse ecological systems.
  • It can typically have water cycles between Earth's surface and Earth's atmosphere.
  • It can typically have tectonic plates that shape Earth's surface through geological processes.
  • ...
  • It can often experience climate change due to natural cycles and human activity.
  • It can often undergo evolutionary pressures that drive species adaptation.
  • It can often host biodiversity across diverse Earth habitats and ecosystems.
  • It can often experience geological events including volcanic eruptions and earthquakes.
  • ...
  • It can range from being a Glacial Earth to being a Greenhouse Earth, depending on its Earth climate state.
  • It can range from being a Tectonically Active Earth to being a Tectonically Stable Earth, depending on its Earth geological cycle phase.
  • ...
  • It can have Earth's Surface with diverse topographical features and biomes.
  • It can have Earth's Atmosphere with multiple atmospheric layers and weather patterns.
  • It can have Earth's Lithosphere containing various mineral deposits and geological formations.
  • It can have Earth's Hydrosphere covering approximately 71% of Earth's surface.
  • It can have Planetary Moon: The Moon, which influences Earth tides and Earth rotation.
  • It can be the only known Goldilocks Planet in The Solar System.
  • It can receive approximately 240 watts per square meter of solar energy from The Sun.
  • ...
• Examples:
  • Earth Geological Eras, such as:
    • Precambrian Earth (4.54 billion to 541 million years ago), characterized by Earth crust formation and primitive life emergence.
    • Paleozoic Earth (541 to 252 million years ago), characterized by complex life emergence and continental formation.
    • Mesozoic Earth (252 to 66 million years ago), characterized by dinosaur domination and supercontinent breakup.
    • Cenozoic Earth (66 million years ago to present), characterized by mammal proliferation and human emergence.
  • Earth Time Periods, such as:
    • The Earth of 1 BYA, when Prokaryotic life dominated and atmosphere oxygenation progressed.
    • The Earth of 100 MYA, during mid-Cretaceous period, with peak dinosaur diversity and complex ecosystems.
    • The Earth of 10 MYA, during Miocene epoch, with mammal evolutionary diversification.
    • The Earth of 1 MYA, when Pleistocene glaciations began, shaping global biodiversity patterns.
    • The Earth of 100 Thousand Years Ago, during Pleistocene epoch, with fluctuating climate affecting terrestrial life.
    • The Earth of 10 Thousand Years Ago, at the end of the last Ice Age, experiencing megafauna extinctions.
    • The Earth of 1 Thousand Years Ago, with early human civilizations altering local ecosystems.
    • The Earth of 1700, experiencing colonial expansions that began affecting native ecosystems.
    • The Earth of 1900, when industrialization accelerated, impacting global ecosystems.
    • The Earth of 1970 (establishment of Earth Day), when global environmental consciousness began to rise.
    • The Earth of 2024, witnessing accelerated climate change and biodiversity loss.
  • Earth Climate States, such as:
    • Hothouse Earth, when greenhouse gas levels create elevated global temperatures.
    • Icehouse Earth, when ice sheets cover significant portions of Earth's surface.
  • ...
• Counter-Examples:
  • Planet Venus, which has an extreme greenhouse atmosphere making it too hot for Earth-like life, lacks liquid water, and has no planetary moon.
  • Planet Mars, which has a thin atmosphere, insufficient magnetic field protection, and cannot currently support Earth-like life due to harsh surface conditions.
  • Extrasolar Earth-sized Planets, which may have similar size to The Earth but typically have different orbital characteristics, atmospheric compositions, and stellar environments.
• See: The Solar System, Terrestrial Planet, Goldilocks Planet, Biosphere, Global Warming, Earth's Atmosphere, Longitude, Latitude, Day, Humanity.

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References

2016

• (Wikipedia, 2016) ⇒ https://en.wikipedia.org/wiki/Earth Retrieved:2016-6-29.
  • Earth (otherwise known as the world,in Gaia,or in Latin: Terra ) 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 harbor life. According to radiometric dating and other sources of evidence, Earth formed about 4.54 billion years ago. 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. 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 within a period of one tropical year (365.24 solar days). The Moon, Earth's only permanent natural satellite, by its gravitational relationship with Earth, causes ocean tides, stabilizes the orientation of Earth's rotational axis, and gradually slows Earth's rotational rate. Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years. 71% of Earth's surface is covered with water. The remaining 29% is land mass — consisting of continents and islands — that together has 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 its first billion years, life appeared in Earth's oceans, and began to affect the atmosphere and surface, leading to the proliferation of aerobic and anaerobic organisms. Since then, the combination of Earth's distance from the Sun, physical properties, and geological history have allowed life to evolve and today thrive. The earliest undisputed life on Earth arose at least 3.5 billion years ago. Earlier physical evidence of life includes biogenic graphite in 3.7 billion-year-old metasedimentary rocks discovered in southwestern Greenland, as well as "remains of biotic life” found in 4.1 billion-year-old rocks in Western Australia. Except when interrupted by mass extinction events, Earth's biodiversity has continually expanded. Although scholars estimate that over 99% of all species of life (over five billion) that ever lived on Earth are today extinct, there are an estimated 10–14 million species still in existence, of which about 1.2 million have been documented and over 86% have not yet been described. More recently, in May 2016, scientists reported that 1 trillion species are estimated to be on Earth currently with only one-thousandth of one percent described. 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 200 sovereign states that interact through diplomacy, conflict, travel, trade, and communication media.

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