Hot Arid and Semi Arid 10.2

What is salt weathering?

• A type of mechanical weathering in areas where temperatures fluctuate around 26-28°C.

• A form of chemical weathering caused by water.

• Erosion carried out by wind-borne particles.

• The process of rocks being dissolved by chemicals.

What is deflation in the context of hot arid and semi-arid environments?

• Rolling larger particles.

• Describes sediments that are carried aloft (in the air) without touching the ground.

• A rolling sand particle gaining sufficient velocity for it to leave the sand surface.

• Particles light enough to be carried by strong winds.

What is the definition of traction?

• Rolling larger particles.

• Particles light enough to be carried by strong winds.

• Describes annual and seasonal variations in the flow of water in a river.

• Describes the sporadic or apparently random (in time) flow of water in a river.

What are rock pedestals?

• Sandy surfaced desert.

• Stoney surfaced desert.

• Mushroom/tower-like shaped features formed as a result of aeolian abrasion.

• Wind deposits accumulations of sand which build into mounds and ridges.

What is a Yardang?

• A wind-eroded rock formation where bedrock has hard and soft rocks side by side aligned to prevailing wind direction

• Wind-eroded rocks in which different resistance of rock strata lie horizontally

• A gently sloping area of bare rock

• A plateau-like feature with steep sides at their edges

What is a Piedmont Zone?

• A lowland area/plain generally located at the base of a mountain

• A period of increased rainfall during a past climate

• A gently sloping area of bare rock

• A crust of salt formed after water has evaporated

What are Bahadas formed by?

• A number of alluvial fans merging

• Wind-eroded rocks where hard and soft rocks lie side by side

• Different resistance of rock strata lying horizontally

• A period of increased rainfall during a past climate

What is the Pleistocene pluvial period noted for?

• Increased rainfall during a past climate

• Wind-eroded rocks where hard and soft rocks lie side by side

• A lowland area/plain generally located at the base of a mountain

• A number of alluvial fans merging

What is a Reg?

• Desert that is stony surfaced.

• Sandy surfaced desert

• Bare rock surfaced desert