Earth phenomena

2017-07-27T21:51:55+03:00[Europe/Moscow] en true El Niño, Sea ice, Melt pond, Aurora, Polar night, Sunrise, Sunset, Tropical cyclone, Lake-effect snow, Asian Dust, Equation of time, Twilight, Alexander's band, Blue hour, List of natural phenomena, Measurement of sea ice, Dusk flashcards Earth phenomena
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  • El Niño
    El Niño /ɛl ˈniːnjoʊ/ (Spanish pronunciation: [el ˈniɲo]) is the warm phase of the El Niño Southern Oscillation (commonly called ENSO) and is associated with a band of warm ocean water that develops in the central and east-central equatorial Pacific (between approximately the International Date Line and 120°W), including off the Pacific coast of South America.
  • Sea ice
    Sea ice arises as seawater freezes.
  • Melt pond
    Melt ponds are pools of open water that form on sea ice in the warmer months of spring and summer.
  • Aurora
    An aurora, sometimes referred to as a polar light, is a natural light display in the sky, predominantly seen in the high latitude (Arctic and Antarctic) regions.
  • Polar night
    The polar night occurs when the night lasts for more than 24 hours.
  • Sunrise
    Sunrise or sun up is the instant at which the upper edge of the Sun appears over the eastern horizon in the morning.
  • Sunset
    Sunset or sundown, is the daily disappearance of the Sun below the western horizon as a result of Earth's rotation.
  • Tropical cyclone
    A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain.
  • Lake-effect snow
    Lake-effect snow is produced during cooler atmospheric conditions when a cold air mass moves across long expanses of warmer lake water, warming the lower layer of air which picks up water vapor from the lake, rises up through the colder air above, freezes and is deposited on the leeward (downwind) shores.
  • Asian Dust
    Asian Dust (also yellow dust, yellow sand, yellow wind or China dust storms) is a meteorological phenomenon which affects much of East Asia year round but especially during the spring months.
  • Equation of time
    The equation of time describes the discrepancy between two kinds of solar time.
  • Twilight
    Twilight is the illumination of the Earth's lower atmosphere when the Sun itself is not directly visible because it is below the horizon.
  • Alexander's band
    Alexander's band or Alexander's dark band is an optical phenomenon associated with rainbows which was named after Alexander of Aphrodisias who first described it in 200 AD.
  • Blue hour
    The blue hour (from La hora azul, in Spanish, or L'Heure Bleue in French) is the period of twilight early in the dawn each morning and late dusk each evening when the sun is at a significant distance below the horizon and the residual, indirect sunlight takes on a predominantly blue hue.
  • List of natural phenomena
    A natural phenomenon is an observable event which is not man-made.
  • Measurement of sea ice
    Measurement of sea ice is important for safety of navigation and for monitoring the environment, particularly the climate.
  • Dusk
    Dusk occurs at the darkest stage of twilight, or at the very end of astronomical twilight just before night.