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  2. Empire Earth - Wikipedia

    en.wikipedia.org/wiki/Empire_Earth

    Empire Earth is a series of real-time strategy video games developed by Stainless Steel Studios and Mad Doc Software, and published by Sierra Entertainment.The games in the series are historical RTS games that are similar to Age of Empires. [2]

  3. Mantle (geology) - Wikipedia

    en.wikipedia.org/wiki/Mantle_(geology)

    The Earth's mantle is a layer of silicate rock between the crust and the outer core. Its mass of 4.01 × 10 24 kg is 67% the mass of the Earth. [1] It has a thickness of 2,900 kilometres (1,800 mi) [1] making up about 84% of Earth's volume. It is predominantly solid, but in geological time it behaves as a viscous fluid

  4. Abundance of the chemical elements - Wikipedia

    en.wikipedia.org/wiki/Abundance_of_the_chemical...

    The abundance of the chemical elements is a measure of the occurrence of the chemical elements relative to all other elements in a given environment. Abundance is measured in one of three ways: by mass fraction (in commercial contexts often called weight fraction), by mole fraction (fraction of atoms by numerical count, or sometimes fraction of molecules in gases), or by volume fraction.

  5. Abundance of elements in Earth's crust - Wikipedia

    en.wikipedia.org/wiki/Abundance_of_elements_in...

    The Earth's crust is one "reservoir" for measurements of abundance. A reservoir is any large body to be studied as unit, like the ocean, atmosphere, mantle or crust. Different reservoirs may have different relative amounts of each element due to different chemical or mechanical processes involved in the creation of the reservoir.

  6. Earth's mantle - Wikipedia

    en.wikipedia.org/wiki/Earth's_mantle

    The internal structure of Earth. Earth's mantle is a layer of silicate rock between the crust and the outer core. It has a mass of 4.01 × 10 24 kg (8.84 × 10 24 lb) and makes up 67% of the mass of Earth. [1] It has a thickness of 2,900 kilometers (1,800 mi) [1] making up about 46% of Earth's

  7. Earth to Echo - Wikipedia

    en.wikipedia.org/wiki/Earth_to_Echo

    Earth to Echo is a 2014 American science fiction film directed by Dave Green, and produced by Ryan Kavanaugh and Andrew Panay. Based on a screenplay by Henry Gayden, the film stars Teo Halm, Brian "Astro" Bradley, Reese C. Hartwig and Ella Wahlestedt as four neighborhood friends who find a robotic, telekinetic alien in the desert, and are soon hunted by dangerous forces who seek to take the ...

  8. Alkaline earth metal - Wikipedia

    en.wikipedia.org/wiki/Alkaline_earth_metal

    The heavier alkaline earth metals react more vigorously than the lighter ones. [2] The alkaline earth metals have the second-lowest first ionization energies in their respective periods of the periodic table [4] because of their somewhat low effective nuclear charges and the ability to attain a full outer shell configuration by losing just two ...

  9. Water distribution on Earth - Wikipedia

    en.wikipedia.org/wiki/Water_distribution_on_Earth

    Most water in Earth's atmosphere and crust comes from saline seawater, while fresh water accounts for nearly 1% of the total. The vast bulk of the water on Earth is saline or salt water, with an average salinity of 35‰ (or 3.5%, roughly equivalent to 34 grams of salts in 1 kg of seawater), though this varies slightly according to the amount of runoff received from surrounding land.