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20 Cards in this Set
- Front
- Back
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Desert
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less than 25cm precipitation
evatranspiration>>precipitation less than 50% of SA covered by vegitation |
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Aridity
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Lacking moisture, especially having insufficient rainfall to support trees or woody plants
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Subtropical desert
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30 N and 30 S latitude
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Continental interior deserts
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W. edges of continents of both N and S hemispheres
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polar deserts
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cold climate prevents air from holding any water. High latitudes
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desert varnish
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black coating on rocks caused by oxidation of metallic cations
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petroglyphs
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illustrations by ancient people done on desert varnish
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dry wash
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streambed in an arroyo or canyon that carries water only briefly after a rain.
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arroyo
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: A small, deep, usually dry channel eroded by a short-lived or intermittent desert stream.
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surface load
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on ground
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suspended load
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carried by wind
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lag deposit
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gravel left behind-->becomes desert pavement
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desert pavement
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extensive lag deposit
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ventifact
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pebbles, cobbles with wind abraided
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yardang
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wind-abraided ridge
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hoo-doo
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is a tall, thin spire of rock that protrudes from the bottom of an arid drainage basin or badland.
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playa lake
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after rain, basin holds water. Only controlled by evaporation and rainfall
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deflation
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lowering of desert floor
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evaporites
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halite, gypsum
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cross bedding
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horizontal units that are internally composed of inclined layers. depositional environment contained a flowing fluid (typically, water or wind).
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