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Any subsurface encounter between water and heatproduces a hydrothermal process. The heat is usually supplied by upwellings of magma from the mantle, the water by precipitation that percolates downward through surface rocks. Some oceanic water enters the mantle at subduction zones and becomes an important ingredient in upper-mantle magmas.

Most hydrothermal processes are driven by convection. Convection occurs because water, like most substances, expands when heated. The result is that hot water rises and cool water sinks. Convection occurs when any water-permeated part of the earth's crust is heated from below: heated water fountains upward over the hot spot and cool water descends around its edges. These movements occur through cracks and channels in the rock, forcing the water to move slowly and remain in constant contact with various minerals. Water convecting through rock is thus an effective means of dissolving, transporting, and depositing minerals. Most deposits of concentrated minerals, including large, shapely crystals, are created by hydrothermal processes.

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13y ago

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a spring that is very ho in which water intermittently boils in it, which results in water and steam bursting into the air.

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16y ago
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sea geysers are small geysers at the bottom of the sea indicating over flowing water gushing and spilling out of it. they are mostly in huge and or large seas and or oceans.

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12y ago
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Its a hot spring that erupts periodly.

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8y ago
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yellow stone

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12y ago
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