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Lava lakes are large volumes of molten lava,, usually basaltic, contained in a volcanic vent, crater, or broad depression.

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A col is the lowest point on a mountain ridge between two peaks.

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A mountain range is a series of mountains ranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure and alignment that have arisen from the same cause.

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A sand devil is a small whirlwind, usually a short duration, that swirls dust, sand, and debris to great heights.

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Kiwis Having Fun In A Large Aussie Dust Devil

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(Contact licensing@viralhog.com for licensing/usage info.) "They call us storm chasers!"

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A plunge pool is a deep depression in a stream bed at the base of a waterfall; it is created by the erosion forces of falling water on the rocks at fall's base where the water impacts

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A marsh is a wetland that is dominated by herbaceous rather than woody plant species. Marshes can often be found at the edges of lakes and streams, where they form a transition between the aquatic and terrestrial ecosystem. They are often dominated by grasses, rushes or reeds.

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A valley is a low area between hills, often with a river running through it. In geology, a valley is a depression that is longer than it is wide.

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A cave is a hollow place in the ground, specifically a natural underground space large enough for a human to enter. Caves form naturally by the weathering of rock and often extend deep underground.

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A dike, is a sheet of rock that formed in a fracture in a              pre-existing rock body. Dikes can be either magmatic or sedimentary in origin. Magmatic dikes form when magma intrudes into a crack then crystallizes as a sheet intrusion, either cutting across layers of rock or through an unlayered mass of rock. Classic dikes are formed when sediment fills a pre-existing crack

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Sand boils or sand volcanoes occur when water under pressure wells up through a bed of sand. The water looks like it is "boiling" up from the bed of sand.

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A graben in depressed block of the Earth's crust bordered by parallel faults.

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A dry lake is either a basin or depression that formerly contained a standing surface water body, which disappeared when evaporation processes exceeded recharge.

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A kame is a glacier land form, an irregularly shaped hill or mound composed of sand, gravel and till that accumulates in a depression on a retreating glacier and is then deposited on the land surface with further melting of the glacier.

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A plain is a flat, sweeping landmass that generally does not change much in elevation.

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A waterfall is a place where water flows over a vertical drop or a series of steep drops, in a course of a stream of river. Waterfalls also occur where melt water drops of the edge of a tabular iceberg or a ice shelf.

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Glacier Caves are caves made with ice from a glacier. They are often called ice caves.

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A tea table is a type of rock column. They usually have a wider top than the base.

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A gully is a land form created by running water, eroding sharply into soil, typically on a hillside. Gullies resemble large ditches or small valleys, but are meters to tens of meters in depth and width. When the gully formation is in process, the water flow rate can be substantial, causing a significant deep cutting action into soil.

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A dell is a small secluded hollow. It is also a grassy, park like, usually partially woody area.

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A captivity in the ground, especially in limestone bedrock, caused by water erosion and providing a route for surface water to disappear underground

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Top Sinkhole videos - from around the world crazy sinkholes! Terrifying views as they happen