Inclined layers in sediment or sedimentary rocks that rocks that reveal the direction of wave or wind transport
What do cross beds represent
The moving front of a ripple or dune
What is the relationship between water currents and cross beds
Cross bed sit at an angle to current direction
Why do desert dunes migrate
Wind erodes material on the back side of the dune and deposits it in the front side of the dune
How do pieces of rock move under the influence of wind
Rolling, sliding, bouncing, suspension
What property of a piece of material will most directly determine how it is carried by wind
Size
What is dust
The particles carried in suspension by wind
Which of the following statements about deserts is true
Water is the most significant agent of erosion in deserts
Which of the following statements characterizes ephemeral streams
Ephemeral streams flow only at certain times of the year
Most of the erosion that took place during the dust bowl years of the 1930 in the Great Plains of North America was the result of which the following process
Wind
In the desert environment how are ventifacts created
Ventifacts are produced on the surface of a rock by the continued impact of very small part carried by the wind
When desert pavement is produced in a desert why do the larger particles accumulate on the surface
The wind can move particles of only a very specific size and it takes away these small particles concentrating the large ones
Fan shaped cones deposited at the mouth of a canyon in a desert are known as
Alluvial fans
Which of the following terms best describe long sinuous bed form that develop perpendicular to the prevailing wind direction in desert environment
Transverse dunes
Which of the following dune types would you expect to exhibit an arced shape that opens in the upwind direction but where the slip face occurs on the downwind side of the dune
Parabolic
The majority of the loess deposits on the Great Plains owe those accumulating to which of the following explanations
Loess in the Great Plains accumulated as fine sediments blown out wash deposits adjacent to the retreating continental ice sheet
Which of the following statements regarding inselbergs in desert landscapes is true
Inselbergs are erosional remnants of the underlying bedrock that are nearly covered by desert deposits in the late stage in the development of mountains deserts landscapes
Statements that are true about wind erosion
Wind is most efficient as an erosional agent in dry places , sediment deposited by wind in deserts can mostly be found in the form of sand dunes and loess deposits, an important erosion related role of wind in a desert is abrasion of rock surfaces
What two basic cycles are glaciers part of
Hydrologic and rock
How does the glacial budget affect the advance of a glacier
Glaciers advance when the budget is unbalanced and accumulation is greater than wastage
Which terms best describe the movement of glaciers
Plastic flow and slip
What will the glacial budget be for a glacier that is in a state of retreat
Wastage exceeds accumulation
Which glacial feature consist of a small glacial valley elevated above the main glacial valley and separated from it by a steep wall
Hanging valley
Which feature is not created by glacial erosion
V shaped valleys
Which of the following events is not one of the major effects of ice ages
Shifting of tectonic plates
Where on the planet were ice sheets most extensive during the ice age
North America
Which of the following can cause dry and arid climate
Presence of a high mountain in the path of moisture bearing wind
Which features are produced by wind erosion
Blowouts
Depositional features created by wind include
Loess dunes
Which type of sand dune consist of a u shaped with the tips pointing upwind forming in area where there is some vegetation present