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  2. Stellar classification - Wikipedia

    en.wikipedia.org/wiki/Stellar_classification

    Most stars are currently classified under the Morgan–Keenan (MK) system using the letters O, B, A, F, G, K, and M, a sequence from the hottest (O type) to the coolest (M type). Each letter class is then subdivided using a numeric digit with 0 being hottest and 9 being coolest (e.g., A8, A9, F0, and F1 form a sequence from hotter to cooler).

  3. Mantle convection - Wikipedia

    en.wikipedia.org/wiki/Mantle_convection

    Mantle convection is the very slow creep of Earth's solid silicate mantle as convection currents carry heat from the interior to the planet's surface. [2] [3] Mantle convection causes tectonic plates to move around the Earth's surface. [4] The Earth's lithosphere rides atop the asthenosphere, and the two form the components of the upper mantle ...

  4. List of satellite map images with missing or unclear data

    en.wikipedia.org/wiki/List_of_satellite_map...

    During talks with the Indian government, Google issued a statement saying "Google has been talking and will continue to talk to the Indian government about any security concerns it may have regarding Google Earth." [4] Google agreed to blur images on request of the Indian government. [1]

  5. Passive cooling - Wikipedia

    en.wikipedia.org/wiki/Passive_cooling

    Passive cooling covers all natural processes and techniques of heat dissipation and modulation without the use of energy. [1] Some authors consider that minor and simple mechanical systems (e.g. pumps and economizers) can be integrated in passive cooling techniques, as long they are used to enhance the effectiveness of the natural cooling process. [7]

  6. Transpirational cooling (biological) - Wikipedia

    en.wikipedia.org/wiki/Transpirational_cooling...

    Earth's energy budget (NASA) Earth’s energy budget reveals the pathways of solar energy to earth, its cycling in earth systems and atmosphere, and release back into space. There is an average of 340.4 watts/m 2 of incoming energy. To maintain a stable climate the same amount of energy must return to space.

  7. Antipodes - Wikipedia

    en.wikipedia.org/wiki/Antipodes

    About 15% of the earth's land has an antipode on land. [3] Rough calculation shows that, of the 29% of the earth that is covered by land, if 15% of that has antipodes on land, then about 4% (0.15 × 29% = 4.35%) of the earth's surface has antipodes that are both land surfaces. Spilhaus estimates this at about 3%. [4]

  8. Nazca lines - Wikipedia

    en.wikipedia.org/wiki/Nazca_Lines

    The Nazca lines (/ ˈ n ɑː z k ə /, /-k ɑː / [1]) are a group of geoglyphs made in the soil of the Nazca Desert in southern Peru. [2] They were created between 500 BC and 500 AD by people making depressions or shallow incisions in the desert floor, removing pebbles and leaving different-colored dirt exposed. [3]

  9. Ground source heat pump - Wikipedia

    en.wikipedia.org/wiki/Ground_source_heat_pump

    A heat pump in combination with heat and cold storage. A ground source heat pump (also geothermal heat pump) is a heating/cooling system for buildings that use a type of heat pump to transfer heat to or from the ground, taking advantage of the relative constancy of temperatures of the earth through the seasons.

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