How Sinkholes Occurs
Sinkholes
are depressions in the ground that form because of erosion and gravity. A sinkhole usually forms by erosion caused by
frequent exposure to water. It is caused by pressure on the soil surface of the
ground that occurs when an underground layer is unable to sustain the structure
of the layer above it. Most sinkholes occur in areas where the bedrock is
formed from soft minerals and rocks like salt, gypsum, limestone, dolomite or
other evaporate classes of rocks.
The flowing acidic water dissolves rock and carves out conduits,
or underground passages, through which more water will eventually flow. These conduits in turn help to develop underground
basins known as recharge areas. These
underground pools of water constantly have water flowing to and from them,
which further erodes the bedrock. Eventually, the bedrock will be so eroded
that it can no longer support the weight of the topsoil above it. When this
happens, the topsoil - also called overburden - caves in, creating the
sinkhole.
This is how a sinkhole is occurred.
Modified
from: curiosity.discovery.com
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