The main topic of the text is the formation and characteristics of desert landforms such as sand sheets, sand dunes, and gypsum dune fields, along with the adaptations of desert ecosystems. It details how wind shapes these features and the survival strategies of flora and fauna in arid conditions. The text also touches on erosional landforms and phenomena like hamadas, reg, and dust storms.
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1
The composition of sand sheets includes horizontal layers of ______ and sand, with occasional ______ and gravel.
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2
When wind speeds surpass ______ per hour, they can create ______ on sand sheets, which shift with the wind.
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3
Dune Migration Process
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4
Dune Slope Variation
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5
Types of Dune Shapes
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6
In ______, the characteristic white dunes are created by wind erosion that breaks down gypsum crystals.
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7
Desert pavement is made up of a layer of closely packed ______, which remains after wind erosion removes finer particles.
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8
Although not fully understood, the formation of desert pavement results in a ______ that resists further erosion.
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9
Desert ecosystem location factors
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10
Desert primary productivity level
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11
Desert fauna breeding strategies
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Opportunistic breeding post-rainfall to capitalize on temporary resource abundance.
12
Desert flora have developed ______ to handle the lack of water, high temperatures, and plant-eating animals.
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13
Certain desert plants have ______ or no leaves at all to cut down on water loss through transpiration.
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14
______, a type of desert plant, are designed to hold water in their trunks and possess unique cells for this purpose.
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15
To reach water sources, desert plants might have either widespread ______ roots or deep ______ to draw water from below.
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16
The ______ is one desert species that has adapted to grow in salty conditions.
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17
Desert plants often have ______ as a defense mechanism to discourage herbivores and safeguard their water reserves.
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18
Desert landforms shaped by erosion
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19
Examples of dramatic desert landscapes
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20
Desert atmospheric phenomena
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