Cool Facts About Sedimentary Rocks For Earth Science Lovers | Kidadl


Cool Facts About Sedimentary Rocks For Earth Science Lovers

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Sedimentary rocks, alongside metamorphic and igneous rocks, are one of the three main rocks found on Earth.

Organic sedimentary rock, chemical sedimentary rock and classic sedimentary rock are the three types of sedimentary rock formations that are found on Earth. Sedimentary rocks usually comprise tiny bits and chunks of other older rocks, plants, dead animals, and microorganisms alongside inorganic sedimentary rock formations that are formed through precipitation.

Sedimentary rocks are used in day-to-day life all over the world with shale, limestone, and sandstone being three of the most commonly found sedimentary rocks. Sedimentary rocks go through the processes of weathering, transportation, and deposition to reach the final end products like shale, quartz sand, and normal sand. Other commonly used sedimentary products include chalk and dolomite that are formed from calcium carbonate that come from a mixture of animal shells, animal carcass, and minerals that accumulated in oceans. Clastic rocks like sandstone consist of pieces of other rocks in them that are a result of water, wind, or ice erosion.

Sand is an example of sedimentary rocks being formed from just one sediment which are of the same size. Some other sedimentary rocks consist of large and small lumps of different varieties of rocks.

If you like this article on facts about sedimentary rocks, be sure to check out articles on Canadian Rockies facts and Chimney Rock facts too!

What Are Sedimentary Rocks

Sedimentary rocks are described as rocks that are formed from sediment. These sediments are deposited over time and comprise many layers on Earth's strata. The other two rock formations alongside the sedimentary rock are igneous rock and metamorphic rock.

Sedimentary rocks are the most commonly found rock formations that we can see on the Earth but form only a small part of the Earth's crust in comparison to metamorphic and igneous rock formations. Shale, sandstone, carbonate, and others make up a large part of sedimentary rocks with a 60%, 20%, 15%, and 5% composition held by each respectively.

As for categories, sedimentary rocks are divided into three varieties - Clastic, Chemical, and Organic sedimentary rocks, all of which consist of mud, minerals, sand, and even fossilized remains of ancient dead sea life.

Clastic sedimentary rocks are examples of large sand accumulation over thousands of years. Some of the common examples of clastic sedimentary rocks are sandstone, conglomerate, breccia, and shale.

Chemical sedimentary rocks are formed when minerals are precipitated from the water because of chemical reactions. Common examples of these sedimentary rocks are flint, gypsum, rock salt, and some limestones.

Organic sedimentary rocks are formed from the skeletons and shells of millions of infinitesimal sea life and the heavy accumulation of plant remains. Some types of limestones and coal are two of the most common examples of organic sedimentary rock formations. Sedimentary rocks are also known as secondary rocks because they are frequently formed by the accumulation of small fragments broken off of pre-existing rocks.

Sedimentary Rocks Formation

Sedimentary rocks are formed through the subsequent cementation and deposition of the materials at the surface of the Earth, mostly within water bodies. These rocks are formed mainly through consolidation and accumulation of sediments, precipitation from solution, and through the coming together of the biogenic activity residue.

Sedimentary rocks are formed slowly as the formation requires a lot of time. Compared to igneous rocks and metamorphic rocks, sedimentary rocks are formed near or on the Earth's surface. Organic matter, small pieces of plants, and minerals are the basic elements that are present within sedimentary rocks.

Chemical sedimentary rocks like limestone and calcium carbonate are found in a variety of regions, from caves and deserts to oceans. These rocks can also be found in the strata or hard bed on the surface of the Earth and can be commonly seen on exposed cliffs.

Limestone, a sedimentary rock, is formed from the remnants of the ocean life that once existed millions of years ago. The White Cliffs of Dover, located in the English region facing France and the Strait of Dover are made up of shells and other fossilized remains of minute animals that died more than 65 million years ago.

Quarries of unconsolidated deposits can be found all over the world where gravel and sand are removed from the construction industry. However, such quarries are often removing sand that are remnants of the Jurassic period! This sandstone and stone can be very hard rock.

Physical Features Of Sedimentary Rocks

Sedimentary rocks have three-dimensional physical characteristics and are larger in size compared to other metamorphic rocks. The size of sedimentary rocks depends on the number of sediments arranged together due to which some sedimentary rocks are as small as requiring microscopes to see clearly or as they can be as large as a boulder!

Bedding, fossil tracks, ripple marks, and mud cracks are some examples of sedimentary structures found occurring naturally.

Other commonly used sedimentary products include chalk

Minerals Found In Sedimentary Rocks

The mineral composition of sedimentary rocks is mainly of two types - authigenic and detrital.

Some of the most common minerals found in both authigenic and detrital sedimentary rocks are feldspar, quartz, mica, gypsum, halite, and calcite.

Clay minerals are also commonly found in sedimentary rocks with chlorite, montmorillonite, kaolinite, vermiculite, and halloysite being some of the clay minerals.

Did You Know...

Coal is one of the most common sedimentary rocks that is a part of the daily lives of human civilization. Coal is formed from the pressurized carcass of dead plants that existed millions of years ago.

The Earth's surface consists of only a small amount of sedimentary rocks.

One of the most important features of sedimentary rocks is their layering structure.

Organic sedimentary rocks were formed through the accumulation of living things that died and were compressed inside the Earth. Organic sedimentary rocks are used as a source of tar and petroleum.

Sedimentary rocks are called so because they are the result of the assemblage of small broken pieces of pre-existing rocks.

The Old Red Sandstone is a massive gathering of rocks from the Devonian age that are found in the North Atlantic region. This formation covers parts of Ireland, Great Britain, Norway, North America, and Greenland.

Here at Kidadl, we have carefully created lots of interesting family-friendly facts for everyone to enjoy! If you liked our suggestions for cool facts about sedimentary rocks revealed for earth science lovers, then why not take a look at 13 Holy St Faustina facts that reveal everything about her religious life or sparkling water facts: is this bubbly water better than tap water?

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