Flashcards in Key Terms Deck (52)
is the maximum amount of evaporation and transpiration which could occur if water supply was unlimited.
radiation emitted from the sun
transfer of heat loss r gain through direct contact
transfer of heat through convective movement of air
radiation emitted from the earth
the percentage of solar radiation reflected, as opposed to absorbed, by the earths surface
surface prevailing winds which blow fro subtropical high pressure cell towards the Equator.
fog created when warm moist air comes into contact with a cold surface
air layer where temperature rises rather than falls with height
Inter-tropical convergence zone
an area of rising air, low pressure, converging surface Trade Winds and high temperatures coincident with the Equator.
deflection of global winds by the rotation of the earth
boundary about 50 degrees N and S of the Equator where cool air from the poles meets warm air form the subtropical high pressure cells producing rain.
small hollows, 5 - 50 cm in size, occurring in clusters or honeycombs with thin partitions strengthened b case hardening.
hollows a few metres across with arch shaped entrances, often developed along lines of weaknesses such as joints and bedding planes.
a hard layer of salt encrusted rock formed where salts have been drawn to the surface by capillary action
isolated pillar of rock with an indented profile
upstanding masses of crystalline rock that project above plains in deserts and semi-arid areas
a weathering process where water reacts with minerals such as feldspars to produce clay minerals
the entrainment and removal by wind of unconsolidated material.
when wind-blown sand abrades rock surfaces
large enclosed depressions partly created by deflation; for example, the Qattara Depression in the Sahara
flat areas encrusted with salt sometimes filled with shallow, saline lakes
surface of stones resting on a finer material such as sand, silt or clay. Known as gibber plains in Australia, and stone pavements in USA. Formed where wind or water selectively removes finer material to leave behind larger stones. Alternative theories suggest that coarse material is brought to the surface by cycles of heating and cooling, freezing and thawing, and wetting and drying.
wind polished stones which look like brazil nuts and are a few centimeters in size
linear ridge of clay, silt or rock sculpted by abrasion and deflation
a type of pedestal rock with a resistant cap of rock
fine sediment carried within the air
movement of sand grains in a series of hops along the ground
rolling or pushing of sediment along the gorund