A gently sloping apron of sediment dropped by an ephemeral stream at the base of a mountain in arid or semi-arid regions.
(1) 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.
A region so arid that it contains no permanent streams except for those that bring water in from elsewhere, and has very sparse vegetation cover.
A dark, rusty-brown coating of iron oxide and magnesium oxide that accumulates on the surface of rock in an arid environment.
An isolated mountain or hill in a desert landscape created by progressive cliff retreat, so that the hill is surrounded by a pediment or an alluvial fan.
A surface accumulation of coarser sediment that forms where wind has blown away finer sediment.
A large, flat-topped hill (with a surface area of several square kilometers) in an arid region.
The flat, typically salty lake bed that remains when all the water evaporates in drier times; forms in desert regions.
The inland side of a mountain range, which is arid because the mountains block rain clouds from reaching the area.
The 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.