GEOL 1010 Lecture Notes - Lecture 10: 30Th Parallel North, Abrasive Blasting, Drumlin
16 Dec 2018
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Document Summary
Pleistocene was the era in which the last ice age occurred. Ice ages lower the seal level, base streams gauge valleys on shelf. Glaciers melt and form harbors such as ny and boston. They receive less than 25 cm of moisture a year. Deserts develop from air circulation patterns, wind and water currents due to solar radiation, and. At 30 degrees north, high pressure cold air descends, heats and evaporates. Topography deserts form on the leeward side of mountains. Deserts also form because of their distance from the ocean but can also form due to their proximity to colder ocean currents. Plateaus are cliffs on sides of mesaz, flat topped mountains. Alluvial fans are fan shaped sediments at the foot of the mountain. Playas are flat central areas of an undrained desert basin. Deflation is the lifting and removal of loose material such as sand and silt.
