Is an intermittent lake on the floor of a desert valley?
A playa is an intermittent lake on the floor ofa desert valley. Steppes are the driest of the true desert lands. Intermittent streams in dry areas of the western UnitedStates are called washes.
What mature desert landscape feature consists of coalesced alluvial fans quizlet?
Bajadas develop from coalescence of alluvial fans along fronts of mountain ranges in arid lands. The steeper, lee slope of a sand dune is called the slip face. Running water is an important erosional agent in many arid lands despite infrequent rainfalls.
How is desert pavement formed quizlet?
How is desert pavement formed? they form through the gradual removal of sand, dust and other fine-grained material by the wind and intermittent rain, leaving the larger fragments behind.
Which sand dunes are long high and parallel with the prevailing wind direction?
seif, a long, narrow sand dune or chain of dunes, generally oriented in a direction parallel to the prevailing wind or in a direction resulting from two or more winds blowing at acute angles to each other.
What are Inselbergs quizlet?
Inselberg. isolated hills on the pediment formed from erosion remnants of mounts (cliff retreat on both sides)
Which of the following statements is the best explanation for the occurrence of the Great Basin Desert in the western United States?
Which of the following statements is the best explanation for the occurrence of the Great Basin Desert in the western United States? The Great Basin Desert exists because it is a rain shadow desert.
Which of the following best describes the climatic factors that cause low latitude deserts like the Sahara in Africa Group of answer choices?
Which of the following best describes the climatic factors that cause low latitude deserts like the Sahara in Africa? Cool, dry air aloft is descending; surface winds are blowing toward the equator.
What is a dry flat lake bed that remains after a temporary lake evaporates called?
What is a dry flat lake bed that remains after a temporary lake evaporates called? Playa.
What is desert pavement formed by?
A common theory suggests that desert pavements are formed through gradual removal of sand and other fine particles by the wind and intermittent rains leaving behind the large fragments. The larger rock particles are shaken into place by actions of different agents such as rain, wind, gravity, and animals.
Which layer consists of desert pavement?
A notable feature of desert pavements is the development of the so-called “vesicular A” (or Av) soil horizon just below the surface of pebbles, gravels, and small stones that form the ground surface of desert pavement. The Av layer consists of dust-sized wind-deposited particles underneath the pavement.
What are the belts of sand dunes formed by the depositional action of the wind called?
Depositional Landforms of Wind According to the shape of a sand dune, there are varieties of sand dune forms like Barchans, Seifs etc. The crescent-shaped dunes are called as Barchans and they are the most common one.
What type of sand dune resembles a sea of sand with waves oriented perpendicular to the wind direction?
A transverse dune also forms where sand supply is great. This dune is a ridge of sand that forms perpendicular to the direction of the wind. The slip face of a transverse dune is often very steep. A group of transverse dunes resembles sand ripples on a large scale.
What does Inselberg mean?
inselberg, (from German Insel, “island,” and Berg, “mountain”), isolated hill that stands above well-developed plains and appears not unlike an island rising from the sea. The early German explorers of southern Africa were impressed by such features, and they dubbed the domed or castlelike highlands inselbergs.
What climatic factor helps form low latitude deserts like the Sahara in Africa?
Which of the following best describes the climatic factors that cause low latitude deserts like the Sahara in Africa? Cool, dry air aloft is descending; surface winds are blowing toward the equator.
What observations of desert pavements undercut the hypothesis that desert pavements form through deflation choose all that apply?
What observations of desert pavements undercut the hypothesis that desert pavements form through deflation? –Windblown silt can accumulate and infiltrate through the pebbles. -There are few to no pebbles found in the sediment beneath the desert pavement.
Why are almost all the lakes in the Great Basin Desert region salty?
The Hydrographic Great Basin is a 200,000 square mile area that drains internally. All precipitation in the region evaporates, sinks underground or flows into lakes (mostly saline).
Which of the following best describes the climatic factors that cause deserts like the Sahara in Africa to form around 30 degrees north and south latitude?
Which of the following best describes the climatic factors that cause low latitude deserts like the Sahara in Africa? Cool, dry air aloft is descending; surface winds are blowing toward the equator. Loess deposits in the central United States ________.
What is under Sahara Desert?
Beneath the sands of the Sahara Desert scientists have discovered evidence of a prehistoric megalake. Formed some 250,000 years ago when the Nile River pushed through a low channel near Wadi Tushka, it flooded the eastern Sahara, creating a lake that at its highest level covered more than 42,000 square miles.
What is a playa in the desert?
A playa is a dry, vegetation-free, flat area at the lowest part of an undrained desert basin. It is a location where ephemeral lakes form during wet periods, and is underlain by stratified clay, silt, and sand, and commonly, soluble salts.
How is a playa lake formed?
Playa Lakes are dry lakebeds located in arid basins or valleys. In general, they form when water evaporates from a lake. As the water evaporates, it leaves behind minerals, which are called evaporites.
What is desert floor made of?
Many desert soils contain prominent, whitish layers called calcic horizons. These are accumulations of calcium carbonate, the same material found in chalk, concrete, and agricultural lime.
Where is a desert pavement?
Desert pavements are found on alluvial fans and piedmonts below mountains in the Mojave and Sonoran Deserts.
Where is desert pavement located?
Desert pavements are found on alluvial fans and piedmonts below mountains in the Mojave and Sonoran Deserts.
How sand dunes are formed in the desert?
Sand dunes are created when wind deposits sand on top of each other until a small mound starts to form. Once that first mound forms, sand piles up on the windward side more and more until the edge of the dune collapses under its own weight.
Which of the lake is formed due to wind action?
Oxbow lakes The Oxbow lakes are formed by the depositional and erosional actions taking place simultaneously. Please note that excessive meandering would result in Oxbow lakes.
What are called sand dunes?
A dune is a mound of sand formed by the wind, usually along the beach or in a desert. Dunes form when wind blows sand into a sheltered area behind an obstacle. Dunes grow as grains of sand accumulate.
What is inselberg class 9 geography?
Inselberg is a small, rounded hill, knob, ridge, or mini-mountain that rises abruptly from relatively flat surroundings. It is also called a monadnock.
What is inselberg in desert?
inselberg, (from German Insel, “island,” and Berg, “mountain”), isolated hill that stands above well-developed plains and appears not unlike an island rising from the sea. The early German explorers of southern Africa were impressed by such features, and they dubbed the domed or castlelike highlands inselbergs.
What process is creating a series of Rift features along the eastern flank of the African continent?
32 Cards in this Set
| What is the approximate population of sub-Saharan Africa? | 700 million |
|---|---|
| What process is creating a series of rift features along the eastern flank of the African continent? | Crustal plates that underlie the African continent are spreading apart. |
How did the geography and climate of the Sahara change over a long period of time?
How did the geography and climate of the Sahara change over a long period of time? The Sahara drained to become a savanna. Then dried to become a desert. What impact did the development of trade between early colonists and Berbers have on North Africa?