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  2. Water distribution on Earth - Wikipedia

    en.wikipedia.org/wiki/Water_distribution_on_Earth

    The total volume of water on Earth is estimated at 1.386 billion km 3 (333 million cubic miles), with 97.5% being salt water and 2.5% being freshwater. Of the freshwater, only 0.3% is in liquid form on the surface. [ 2][ 3][ 4] Because the oceans that cover roughly 70.8% of the area of Earth reflect blue light, Earth appears blue from space ...

  3. List of currently active United States military land vehicles

    en.wikipedia.org/wiki/List_of_currently_active...

    Armored combat support vehicles. M1 Assault Breacher Vehicle – 39. M4 Command and Control Vehicle (C2V) – 25. M9 Armored Combat Earthmover – 447. M60A1 AVLB – 125. M88A2 Hercules. M104 Wolverine – 44.

  4. List of current formations of the United States Army - Wikipedia

    en.wikipedia.org/wiki/List_of_current_formations...

    This is a list of current formations of the United States Army, which is constantly changing as the Army changes its structure over time. Due to the nature of those changes, specifically the restructuring of brigades into autonomous modular brigades, debate has arisen as to whether brigades are units or formations; for the purposes of this list, brigades are currently excluded.

  5. Hydrosphere - Wikipedia

    en.wikipedia.org/wiki/Hydrosphere

    Hydrosphere. The hydrosphere (from Ancient Greek ὕδωρ (húdōr) 'water' and σφαῖρα (sphaîra) 'sphere') [ 1][ 2] is the combined mass of water found on, under, and above the surface of a planet, minor planet, or natural satellite. Although Earth 's hydrosphere has been around for about 4 billion years, [ 3][ 4] it continues to ...

  6. Atmosphere of Earth - Wikipedia

    en.wikipedia.org/wiki/Atmosphere_of_Earth

    The atmosphere of Earth is composed of a layer of gas mixture that surrounds the Earth's planetary surface (both lands and oceans ), known collectively as air, with variable quantities of suspended aerosols and particulates (which create weather features such as clouds and hazes ), all retained by Earth's gravity.

  7. Global commons - Wikipedia

    en.wikipedia.org/wiki/Global_commons

    Global commons. Global commons is a term typically used to describe international, supranational, and global resource domains in which common-pool resources are found. Global commons include the earth's shared natural resources, such as the high oceans, the atmosphere and outer space and the Antarctic in particular. [ 1]

  8. Water cycle - Wikipedia

    en.wikipedia.org/wiki/Water_cycle

    The water cycle (or hydrologic cycle or hydrological cycle ), is a biogeochemical cycle that involves the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time. However, the partitioning of the water into the major reservoirs of ice, fresh water, salt water and ...

  9. List of currently active United States military watercraft

    en.wikipedia.org/wiki/List_of_currently_active...

    USNS Big Horn ( Henry J. Kaiser -class oiler) Watson -class vehicle cargo ship – 8 active. Bob Hope -class vehicle cargo ship – 7 active. Shughart -class vehicle cargo ship – 3 active. Gordon -class vehicle cargo ship – 2 active. Supply -class fast combat support ship – 2 active. Lewis and Clark -class dry cargo ship – 14 active.