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In addition to being mostly uninhabited, the Great Australian Desert is diverse, where it consists of semi-desert grassy or mountainous landscapes, xeric shrubs, salt pans, gibber (stony) deserts, red sand dunes, sandstone mesas, rocky plains, open tree savannahs and bushland with a few rivers and salt lakes, which are mostly seasonally dry and ...
Barreiro da Faneca – clayey expanse in the Azores. Błędowska Desert – area of sands in Poland. The Burren – limestone karst in County Clare, Republic of Ireland. Carcross Desert – sand-dune system in Yukon, Canada. Chara Sands – region of Siberia, Russia. Deliblatska Peščara – sand expanse in Vojvodina, Serbia.
Plain – Expanse of land that is mostly flat and treeless; Plateau – Highland area, usually of relatively flat terrain; Ravine – Small valley, often due to stream erosion; Ridge – Long, narrow, elevated landform; Rock shelter – Shallow cave-like opening at the base of a bluff or cliff; Saddle – Land connecting two high points
The climate is mainly dry. Most areas get around 100 mm (3.9 in) of rain per year. Unlike the Sahara Desert—more than half of which is hyperarid (having rainfall of less than 50 mm (2.0 in) per year)—the Arabian Desert has only a few hyperarid areas. These rare driest areas may get only 30 to 40 mm (1.6 in) of rain per year.
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The biodiversity of dry and sub-humid lands allows them to adapt to the unpredictable rainfall patterns that lead to floods and droughts. [12] These areas produce the vast amount the world's crops and livestock. Even further than producing the vast majority of crops in the world, it is also significant because it includes many different biomes.
Ancient dry riverbeds—called omuramba—traverse the central northern reaches of the Kalahari and provide standing pools of water during the rainy season. A semi-desert, with huge tracts of excellent grazing after good rains, the Kalahari supports more animals and plants than a true desert, such as the Namib Desert to the west.
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 and 6,000 metres (9,800 and 19,700 ft).Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth's surface.