Moisture precipitates out of the atmosphere primarily as three types of rain: convective, stratiform and orographic. In each case, warm, moist air is lifted up and suspended until it reaches saturation and then discharges its water content as rain.Know More
Convective rain is the simplest form, and it occurs mainly in tropical regions. In a convection system, water evaporates off of ocean and lake surfaces, rises through the air by simple convection and falls when the air is saturated. Convective fronts are usually localized and limited in their horizontal extent.
Stratiform rain results when a moist warm front encounters cooler, drier air. The cool air is denser than the warm front, so it subducts under the warm air and drives it to a higher altitude. Then, if conditions are right for precipitation, the warm mass discharges.
Orographic rain is driven by a process very similar to stratiform rain, but with the rain-laden clouds rising against mountains rather than sliding over cool air. A typical orographic rain begins over the ocean as a convection cell, moves toward land and is suddenly lifted high by a coastal range of mountains. Orographic systems usually drop their moisture soon after making landfall and rarely have the energy to penetrate deep inland. This deprives inland areas of rain and creates rain shadow deserts such as the Atacama.Learn More
On a clear day the sky is blue to deep blue. At dawn and dusk the stretch of sky nearest the sun changes to shades of red, orange and yellow. The color of the sky is primarily determined by the way air molecules scatter light relative to the sun's angle.Full Answer >
The ozone layer absorbs most of the biologically damaging ultraviolet radiation from the Sun, allowing only a small amount to pass. Through UV absorption, it creates a source of heat that defines the temperature characteristics of Earth's stratosphere. Left unfiltered, certain frequencies of UV radiation would more easily penetrate the protective coverings of organisms, causing severe damage to DNA molecules.Full Answer >
Altitude affects climate in that the higher up you get, the more the temperature drops. The temperature goes down roughly 4 degrees Fahrenheit for every 1,000 feet you climb. Altitude is the subject's distance from the sea. This is why a lot of high-up places such as mountaintops often get snow for most of the year when other places do not, no matter how low the temperature drops.Full Answer >
The air humans breathe is made up of about 78 percent nitrogen, 21 percent oxygen, and 1 percent carbon dioxide and argon. Trace gases include krypton, methane, neon, helium and hydrogen. Air generally contains trace amounts of water vapor, as well, with greater concentrations occurring near sea level.Full Answer >