How Sedimentary Rocks Are Formed


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** *How Sedimentary Rock Is Formed* **

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*For thousands, even millions of years, little pieces of our earth have
been eroded--broken down and worn away
by wind and water. These little bits of our earth are washed downstream
where they settle to the bottom of the rivers, lakes, and oceans. Layer
after layer of eroded earth is deposited on top of each. These layers are
pressed down more and more through time, until the bottom layers slowly
turn into rock.*

For examples of sedimentary rocks, take a look at these:







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how are sedimentary rocks formed

Sedimentary rock - Wikipedia, the free encyclopedia


** Sedimentary rock **

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Middle Triassic marginal marine sequence of siltstones (below) and
limestones (above), Virgin Formation, southwestern Utah, USA

*Sedimentary rocks* are types of rock that are formed by the deposition of
material at the Earth's surface and within bodies of water. Sedimentation
is the collective name for processes that cause mineral and/or organic
particles (detritus) to settle and accumulate or minerals to precipitate
from a solution. Particles that form a sedimentary rock by accumulating are
called sediment. Before being deposited, sediment was formed by weathering
and erosion in a source area, and then transported to the place of
deposition by water, wind, ice, mass movement or glaciers which are called
agents of denudation.

The sedimentary rock cover of the continents of the Earth's crust is
extensive, but the total contribution of sedimentary rocks is estimated to
be only 8% of the total volume of the crust.^[1] Sedimentary rocks are only
a thin veneer over a crust consisting mainly of igneous and metamorphic
rocks. Sedimentary rocks are deposited in layers as strata, forming a
structure called bedding. The study of sedimentary rocks and rock strata
provides information about the subsurface that is useful for civil
engineering, for example in the construction of roads, houses, tunnels,
canals or other constructions. Sedimentary rocks are also important sources
of natural resources like coal, fossil fuels, drinking water or ores.

The study of the sequence of sedimentary rock strata is the main source for
scientific knowledge about the Earth's history, including palaeogeography,
paleoclimatology and the history of life. The scientific discipline that
studies the properties and origin of sedimentary rocks is called
sedimentology. Sedimentology is both part of geology and physical geography
and overlaps partly


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