21 Multiple choice questions
region so arid that it contains no permanent streams except for those
that bring water in from elsewhere, and has very sparse vegetation
- The change in the position of a cliff face caused by erosion.
isolated mountain or hill in a desert landscape created by progressive
cliff retreat, so that the hill is surrounded by a pediment or an
- A mosaic-like stone surface forming the ground in a desert.
- A medium-sized, flat-topped hill in an arid region.
- A desert rock whose surface has been faceted by the wind.
- The inland side of a mountain range, which is arid because the mountains block rain clouds from reaching the area.
- The process of lowering the land surface by wind abrasion.
- The broad, nearly horizontal bedrock surface at the base of a retreating desert cliff.
- A wedge-shaped pile of rock fragments that accumulates at the base of a cliff.
- Sediment that rolls or bounces in wind along the ground surface.
- The process of transforming nondesert areas into desert.
- The channel of an ephemeral stream when empty of water.
- A dark, rusty-brown coating of iron oxide and magnesium oxide that accumulates on the surface of rock in an arid environment.
- A surface accumulation of coarser sediment that forms where wind has blown away finer sediment.
- A gently sloping apron of sediment dropped by an ephemeral stream at the base of a mountain in arid or semi-arid regions.
- A large, flat-topped hill (with a surface area of several square kilometers) in an arid region.
A conduit in a magma chamber in the shape of a long vertical pipe
through which magma rises and erupts at the surface; (2) an isolated
column of strata in an arid region.
- The flat, typically salty lake bed that remains when all the water evaporates in drier times; forms in desert regions.
movement of a sediment in which grains bounce along their substrate,
knocking other grains into the water column (or air) in the process.
- Tiny solid grains carried along by a stream without settling to the floor of the channel.