Sedimentary Rocks Questions

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Very Short Answers Questions [1 Mark Questions]

Ques. Which of the following is responsible for creating sedimentary rocks?

1. Precipitation
2. Weathering and lithification
3. Erosion
4. All of the above

Ans. The correct answer is d. All of the above

Explanation: The processes responsible for the creation of sedimentary rocks include erosion, weathering and lithification, and precipitation.

Ques. Which of the following is a sedimentary rock?

1. Quartzite
2. Schist
3. Sandstone
4. Granite

Ans. The correct answer is c. Sandstone

Explanation: Sandstone is a type of sedimentary rock formed by the compacting and cementing of sand grains over hundreds or millions of years.

Ques. Chalk is a type of _____

1. Limestones
2. Dolomites
3. Coal
4. Quartz

Ans. The correct answer is a. Limestones

Explanation: Chalk is a sedimentary carbonate rock that is soft, white, and porous. It is a form of limestone made up of the mineral calcite that formed deep below the sea by the compression of microscopic plankton that had settled to the sea bottom.

Ques. Which among the following is NOT a sedimentary rock?

1. Iron ores
2. Limestones
3. Quartz
4. Slate

Ans. The correct answer is d. Slate

Explanation: Because slate is a metamorphic rock, it is not classified as a sedimentary rock.

Ques. Which of the following sedimentary rocks is used in the manufacturing of cement?

1. Dolomites
2. Limestones
3. Coal
4. Quartz

Ans. The correct answer is b. Limestones

Explanation: Limestone is the most common type of calcium carbonate, and it is widely utilized in the manufacture of cement.

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Short Answers Questions [2 Marks Questions]

Ques. What is sedimentary rock?

Ans. Sedimentary rocks form near or on the Earth's surface, whereas metamorphic and igneous rocks occur deep inside the Earth. Erosion, weathering, dissolution, precipitation, and lithification are the major geological processes that result in the formation of sedimentary rocks.

Ques. How are chemical sedimentary rocks formed?

Ans. Chemical sedimentary rocks form as a result of chemical precipitation, which begins when water flowing through rock dissolves certain minerals. When water evaporates, these minerals are transported away from their source and eventually redeposited, or precipitated.

Ques. What is meant by sedimentation?

Ans. Sedimentation is the process of heavier insoluble particles settling to the bottom of a liquid. Sediments are the heavier insoluble particles that settle to the bottom of the liquid. For example in a sand and water combination, sand settles to the bottom after a period of inactivity. This is called sedimentation.

Ques. Give examples of biochemical sedimentary rocks.

Ans. Some examples of biochemical sedimentary rocks are

• Chalk
• Banded Iron Formation (Bif)
• Limestone
• Coal, Bituminous, Anthracite, Lignite, Jet, Peat.
• Coquina
• Chert Or Flint

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Long Answers Questions [3 Marks Questions]

Ques. What are the properties of sedimentary rocks?

Ans. The following are the properties of sedimentary rocks

• Color: The color of these rocks is typically caused by iron, a metal with two major oxides: iron(II) oxide and iron(III) oxide. Only in low oxygen (anoxic) environments does iron(II) oxide (FeO) form, giving it a grey or greenish color. In dry continental locations, these rocks are in direct touch with the atmosphere, and oxidation is a primary process that causes the rock to become red or orange. Because of the presence of organic components in the rock, it may turn black or grey.
• Texture: Although texture is a small-scale quality, it influences many of a rock's large-scale characteristics. For example, the density, porosity, and permeability of the rock. Chemical sedimentary rocks have a non-clastic structure and are composed of crystals. Clay matrix, detrital grain size and sorting, and particle roundness are all significant factors in determining the texture of these stones.
• Mineralogy: The majority of these rocks are composed of quartz or calcite. Sedimentary rocks are distinguished from igneous and metamorphic rocks by the presence of a diverse range of essential minerals. In other words, the origins of minerals in these rocks are typically more complex than in igneous rocks.

Ques. What are the uses of sedimentary rocks?

Ans. Most monuments and buildings make use of sedimentary rock. Some applications for this type of rock are listed below.

• Cement is made from limestone.
• Building stones are made of limestone and sandstone.
• Quartz is a sedimentary rock that is used in the production of glass.
• Plaster is made from rock gypsum.
• Sedimentary rocks develop and contain natural gas, oil, coal, uranium, and other energy resources.

Ques. How are rocks classified?

Ans. Rocks are classified as

• Igneous rocks: When molten rock (magma or lava) cools and hardens, igneous rocks develop. 
• Sedimentary rocks: They form as particles settle out of water or air, or when minerals precipitate from water. They build up in layers. 
• Metamorphic rocks: Existing rocks undergo metamorphism when they are changed by heat, pressure, or reactive fluids such as hot, mineral-laden water. The majority of rocks are composed of minerals that include silicon and oxygen, the two most prevalent elements in the Earth's crust.

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Very Long Answers Questions [5 Marks Questions]

Ques. How are Sedimentary Rocks Formed?

Ans. Sedimentary rocks are formed from the sediments of previously existing rocks. Sedimentary rocks are formed by a geological process known as lithification, which includes many steps: 

• To begin, existing rocks are eroded and weathered, resulting in the physical breakdown of the rocks and subsequent transport of debris away from the original rock.
• Sediments usually occur by chemical breakdown caused by rainfall or dissolution. The next stage in the formation of sedimentary rocks is the movement of debris.
• Gravity plays an important part in helping transportation since most sediments are carried by wind or moving amounts of water such as rivers or glacial ice.
• After being transported, the sediments begin to deposit. Slit deposition may also occur as a result of precipitation when exposed to an adequate temperature and air pressure. Organic reefs are an example of sedimentary rocks.
• Layers of sediment begin to pile up on top of one another as the sediments begin to deposit, a process known as burial.
• Once these sediments reach a certain depth, they are compressed and cemented into solid rocks by the process of lithification. This is how sedimentary rocks are formed. Some of the most common sedimentary rocks include chalk, clay, flint, and shale.

Ques. What are the different types of sedimentary rocks?

Ans. The different types of sedimentary rocks are

• Clastic Sedimentary Rocks: Clastic sedimentary rocks are sedimentary rocks that originated from older rocks. Weathering loosens the broken pieces of these rocks, which are then moved to a basin where the sediment is deposited, producing sedimentary rocks.
• Biochemical Sedimentary Rocks: Biochemical sedimentary rocks are composed of rocks formed by organic processes. Calcium carbonate shells from snails or clams, for example, can contribute to the development of limestone.
• Chemical Sedimentary Rocks: Chemical sedimentary rocks, such as halite and gypsum, form when minerals in solutions become supersaturated and hence precipitate inorganically.

Ques. What are the characteristics of sedimentary rocks?

Ans. The following are the characteristics of sedimentary rocks

• Sedimentary rocks have a range of porosity from 1% to 50%. This is due to the fact that the particles in organic and clastic sedimentary rocks, as well as chemical sedimentary rocks, are not always evenly packed throughout the formation process.
• Porosity is believed to be 27% in more compact sedimentary rocks, although it can exceed 47% in more loosely packed rocks. While sandstones can have as little as 5% porosity, clays can have up to 50%.
• Even though certain sedimentary rocks are permeable, they are mostly watertight. Only a few types of sedimentary rocks are pervious if they contain joints or fissures.
• Sedimentary rocks' sphericity changes depending on where they travel throughout the transit phase. The farther sedimentary rocks are from their parent rock, the more rounded and spherical they become. 
• Similarly, sediments that have traveled a greater distance include more sorted debris than sediments that have traveled a shorter distance.
• Sedimentary rocks feature mud cracks, which are fractures formed as the water in the sediments dries out.
• These rocks have beddings of varying sizes, ranging from tiny laminas to large strata. These are mainly seen in horizontal environments as a consequence of different agent's deposition.

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