How to Describe a Sedimentary Rock

2 How are sediments formed by erosion. These particles and chemicals come from the weathering breaking apart in place and erosion carrying away and breaking apart while moving of rocks on the Earths surface.

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There are two types of sedimentary rocks referred to as either detritus or chemical.

. Describe how sedimentary rocks can be used to reveal the past history of the Earth. Over years these pieces of rock or sediments are pressed together by the weight of new deposits on top of them and cement together to form rocks. Texture is an important aspect in the description of sedimentary rocks and can be useful in interpreting the mechanisms and environments of deposition.

Sedimentary rocks layered rocks are made by the deposition of particles carried in air or water and by the precipitation of chemicals dissolved in water. Name and describe the origin of five sedimentary rocks that form from the accumulation of dead plant or animal materials. How do you describe the texture of a rock.

Weakly indurated rocks tend to retain some of their original porosity but this decreases as compaction and cements develop. The texture of a rock is the size shape and arrangement of the grains for sedimentary rocks or crystals for igneous and metamorphic rocks. Also of importance are the rocks extent of homogeneity ie uniformity of composition throughout and the degree of isotropy.

6 How sediments rock particles and other debris from weathering will lead to erosion and. Sedimentary rocks cover most of the Earths rocky surface but they only make up a very small percentage of the planets crust. The Click to see full answer.

Below we define a few of the terms geologists use to describe these textures. Pieces of rock are loosened by weathering then transported to some basin or depression where sediment is trapped. 3 What is sediment weathering and erosion.

18 How are sedimentary rocks classified 3 types describe each. If the sediment is buried deeply it becomes compacted and. Sedimentary rocks form on or near Earths surface.

Clastic Sedimentary Rock- Sedimnetary rocks formed from fragments of rocks cemented together by minerals such as calciteChemical Sedimentary Rock- Sedimentary rocks formed from a solution of. Sedimentary rocks are as the name suggests formed from the buildup of sediment. Erosion and weathering include the effects of wind.

4 How do the products of weathering become sediments. It is also a major control on the porosity and permeability of a sediment. 1 Describe How Sediments Are Produced By Weathering And Erosion.

Clastic sedimentary rocks are made up of pieces clasts of pre-existing rocks. The most important geological processes that lead to the creation of sedimentary rocks are erosion weathering dissolution precipitation and lithification. Eroded particles of rock are transported by wind water and ice and deposited on dry land on the beds of rivers and lakes or in the seas.

Sedimentary fabrics like these record paleocurrent flow directions. Porosity is a measure of the void or pore space between adjacent grains. Some sedimentary rock facts are provided below.

Sedimentary rocks are formed by sediment that is deposited over time. Sediment framework and matrix. Some of the more common types of sedimentary rock include sandstone shale limestone and coal.

Flint is a hard sedimentary form of the mineral quartz. The texture of many sedimentary rocks can only be studied adequately with a microscope and thin-sections. Sedimentary rocks are formed on or near the Earths surface in contrast to metamorphic and igneous rocks which are formed deep within the Earth.

At the point of deposition all sediments have porosity. Sedimentary rocks are the rocks resulting from the consolidation of loose sediments which have been derived from the pre-existing rocks and minerals chemical precipitation from solution and organic remains of plants and animals at or near the earths surface. This means they form over time on the surface of the Earth unlike other types of rock such as.

19 How can you tell if a rock is clastic or chemical. Grains or clasts do not interlock but rather are piled together and cemented. 5 What is the product of weathering and erosion.

Describe and draw a chart that illustrates the classification of those sedimentary rocks that are made from weathered rock material. The Sedimentary Rock Textures Chart on the following illustrates the major sedimentary rock textures. Clastic sedimentary rocks are the group of rocks most people think of when they think of sedimentary rocks.

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