Signs of Evaporation

Evaporation is the transformation of water liquid to gas as it moves from the Earth's surface into the overlying atmosphere. This surface may be the ground, vegetation and water in the form of rivers, lakes, oceans and ice sheets. Transpiration is the evaporation of water from all forms of vegetation. The energy driving the evaporation comes primarily from the sun in the form of solar radiation. Evaporation forms part of the Earth's water cycle, whose other phases are transpiration, condensation and precipitation.
  1. Fog and Clouds

    • Foggy field and forest

      When evaporated moisture rises from the Earth's surfaces it mixes with the drier air above and cools. Water or ice droplets suspended in the air mixture create a mist and fog. This shows that evaporation has occurred and is the beginning of cloud formation. Solar radiation throughout the day evaporates and dissipates this fog, causing the water vapor to rise higher through the atmosphere to create clouds.

    Salt

    • Salt flats

      Salt in the form of sodium chloride is the most common mineral sediment formed as a result of evaporation of seawater. The technical term for such a mineral is evaporite. Other common minerals produced by the evaporation of seawater are calcium carbonate (calcite) and two versions of sodium sulfate: gypsum and anhydrite.

    Deserts

    • Desert sand dunes

      Deserts are sparsely-vegetated arid areas which occupy about one third of the Earth's surface. They are the result of weather systems where evaporation exceeds precipitation as rainfall. Deserts may be hot or cold, but they are always dry. The Atacama Desert in northern Chile is the world's driest hot desert while Antarctica is the world's driest cold desert.

    Black Holes

    • Cosmic black hole vortex

      Black holes are regions in space where nothing can escape, not even gravity. British mathematician Stephen Hawking hypothesized that such holes emit radiation and eventually disappear. Astronomers have termed this phenomenon as "Black Hole Evaporation".

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