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  2. Phreatic zone - Wikipedia

    en.wikipedia.org/wiki/Phreatic_zone

    The phreatic zone, saturated zone, or zone of saturation, is the part of an aquifer, below the water table, in which relatively all pores and fractures are saturated with water. The part above the water table is the vadose zone (also called unsaturated zone). The phreatic zone size, color, and depth may fluctuate with changes of season, and ...

  3. Spring (hydrology) - Wikipedia

    en.wikipedia.org/wiki/Spring_(hydrology)

    A spring is a natural exit point at which groundwater emerges from the aquifer and flows onto the top of the Earth's crust (pedosphere) to become surface water. It is a component of the hydrosphere, as well as a part of the water cycle. Springs have long been important for humans as a source of fresh water, especially in arid regions which have ...

  4. Wedding invitation - Wikipedia

    en.wikipedia.org/wiki/Wedding_invitation

    Wedding invitation. A wedding invitation is a letter asking the recipient to attend a wedding. It is typically written in the formal, third-person language and mailed five to eight weeks before the wedding date. Like any other invitation, it is the privilege and duty of the host—historically, for younger brides in Western culture, the mother ...

  5. Vapour pressure of water - Wikipedia

    en.wikipedia.org/wiki/Vapour_pressure_of_water

    759.9625. 1.0000. The vapor pressure of water is the pressure exerted by molecules of water vapor in gaseous form (whether pure or in a mixture with other gases such as air). The saturation vapor pressure is the pressure at which water vapor is in thermodynamic equilibrium with its condensed state. At pressures higher than vapor pressure, water ...

  6. Aquifer - Wikipedia

    en.wikipedia.org/wiki/Aquifer

    An aquifer is an underground layer of water -bearing material, consisting of permeable or fractured rock, or of unconsolidated materials (gravel, sand, or silt). Aquifers vary greatly in their characteristics. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology. Related terms include aquitard, which ...

  7. Wedding customs by country - Wikipedia

    en.wikipedia.org/wiki/Wedding_customs_by_country

    The host sends invitations to the wedding guests, usually one to two months before the wedding. Invitations may most formally be addressed by hand to show the importance and personal meaning of the occasion. Large numbers of invitations may be mechanically reproduced. As engraving was the highest quality printing technology available in the ...

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