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  2. Köppen climate classification - Wikipedia

    en.wikipedia.org/wiki/Köppen_climate_classification

    Dsd = Mediterranean-influenced extremely cold subarctic climate; coldest month averaging below −38 °C (−36.4 °F) and 1–3 months averaging above 10 °C (50 °F). At least three times as much precipitation in the wettest month of winter as in the driest month of summer, and the driest month of summer receives less than 30 mm (1.2 in).

  3. Biodiversity - Wikipedia

    en.wikipedia.org/wiki/Biodiversity

    It is greater in the tropics as a result of the warm climate and high primary productivity in the region near the equator. Tropical forest ecosystems cover less than one-fifth of Earth's terrestrial area and contain about 50% of the world's species. [2] There are latitudinal gradients in species diversity for both marine and terrestrial taxa. [3]

  4. Human impact on the environment - Wikipedia

    en.wikipedia.org/wiki/Human_impact_on_the...

    Human impact on the environment. From top left, clockwise: satellite image of Southeast Asian haze; IAEA experts investigate the Fukushima disaster; a seabird during an oil spill; depiction of deforestation of Brazil's Atlantic forest by Portuguese settlers, c. 1820 –25; acid mine drainage in the Rio Tinto; industrial fishing in 1997, a practice that has led to overfishing.

  5. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    The refractive index of liquid water (1.333 at 20 °C (68 °F)) is much higher than that of air (1.0), similar to those of alkanes and ethanol, but lower than those of glycerol (1.473), benzene (1.501), carbon disulfide (1.627), and common types of glass (1.4 to 1.6). The refraction index of ice (1.31) is lower than that of liquid water.

  6. Google - Wikipedia

    en.wikipedia.org/wiki/Google

    On 18 September 2024, Alphabet's Google won a €1.49 billion ($1.7 billion) antitrust fine from the European Union, while Qualcomm's efforts to repeal a penalty were unsuccessful. The General Court agreed with many of the European Commission's findings but annulled the Google fine, stating that the Commission failed to consider all relevant ...

  7. Philadelphia - Wikipedia

    en.wikipedia.org/wiki/Philadelphia

    Interactive map outlining Philadelphia. ... Most Lenape were pushed out of the region during the 18th century by expanding ... 4.1 3.8 2.0 0.2 0.0 0.0 0.0 0.0 0.0 ...

  8. ARPANET - Wikipedia

    en.wikipedia.org/wiki/ARPANET

    1.4.3 MILNET, phasing out. 1.5 Decommissioning. ... with the Culler-Fried Interactive Mathematics Center's IBM 360/75, ... ARPA network map 1973.