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Moraine may also form by the accumulation of sand and gravel deposits from glacial streams emanating from the ice margin. These fan deposits may coalesce to form a long moraine bank marking the ice margin. [11] Several processes may combine to form and rework a single moraine, and most moraines record a continuum of processes.
Water vapor has lower density than that of air and is therefore buoyant in air but has lower vapor pressure than that of air. When water vapor is used as a lifting gas by a thermal airship the water vapor is heated to form steam so that its vapor pressure is greater than the surrounding air pressure in order to maintain the shape of a ...
A washboard moraine, also known as minor or corrugated moraine, is a geomorphic feature caused by glaciers. The name "washboard moraine" refers to the fact that, from the air, it resembles a washboard .
The vapor then condenses into tiny water droplets which freeze if the temperature is low enough. These millions of tiny water droplets and/or ice crystals form the contrails. The time taken for the vapor to cool enough to condense accounts for the contrail forming some distance behind the aircraft. At high altitudes, supercooled water vapor ...
As a vortex core begins to form, the water in the air (in the region that is about to become the core) is in vapor phase, which means that the local temperature is above the local dew point. After the vortex core forms, the pressure inside it has decreased from the ambient value, and so the local dew point ( T c {\displaystyle T_{c}} ) has ...
The droplet then grows by diffusion of water molecules in the air (vapor) onto the ice crystal surface where they are collected. Because water droplets are so much more numerous than the ice crystals, the crystals are able to grow to hundreds of micrometers or millimeters in size at the expense of the water droplets by the Wegener–Bergeron ...
A moist air parcel may also contain liquid droplets and ice crystals in addition to water vapor. A net mixing ratio w T {\displaystyle w_{T}} can be defined as the sum of the mixing ratios of water vapor w {\displaystyle w} , liquid w i {\displaystyle w_{i}} , and ice w l {\displaystyle w_{l}} present in the parcel.
The biotic pump describes how water vapor given off by trees can drive winds and these winds can cross continents and deliver this moisture to far off forests. With this process and the fact that the foliage in forests have surface area, the forests can deliver more moisture to the atmosphere than evaporation from a body of water or equivalent ...