Igneous rocks may form via crystallization. This forms granular, crystalline rocks. But sometimes, these rocks form without crystallization. Then the rocks formed are known as natural glasses. We can observe the occurrence of igneous rocks at a wide range of landforms such as shields, platforms, orogens, basins, extended crusts, ocean crusts, etc.
Moreover, most of the oceanic crusts on Earth are made of igneous rocks. Sedimentary rocks are a type of rocks that form via accumulation or deposition of sediment materials. This formation involves the deposition or accumulation followed by cementation with minerals or organic matter.
These rocks form on the surface of the Earth. Figure 2: Sedimentary Rock. Moreover, there are around different varieties of these rocks. Out of these, granite is a widely known igneous rock that is used for constructing most kitchen surfaces.
Sedimentary rocks are derived from pre-existing rocks and pieces of once-living animals that go through the process of weathering, transport, deposition , compaction, and cementation. These rocks are formed over millions of years at the bottom of water bodies like oceans and rivers.
Sedimentary rocks can be categorized into clastic, organic, and chemically precipitated rocks. Clastic sedimentary rocks are those which are created in response to mechanical weathering on pre-existing rocks. Organic sedimentary rocks are those which are derived from accumulated and deposited remains of dead plants and animals. Sometimes, a chemical reaction between two minerals present in rocks may occur.
On cooling down, these minerals precipitate and turn into chemical sedimentary rocks. Metamorphic rocks are formed when pre-existing rocks are subjected to change in heat and pressure causing physical and chemical changes in them.
Explanation : The answer is "Magma cools slowly, creating a coarse grained texture. What type of rock is granite? Pictured above. Possible Answers: sedimentary. Correct answer: igneous. Explanation : The answer is "igneous. Explanation : The answer is "sedimentary. Possible Answers: quartz. Correct answer: shale. Explanation : The answer is "shale" because shale is a type of sedimentary rock. Slate is a metamorphic rock.
Which best describes how slate is formed? Possible Answers: compaction of silica and sand. Correct answer: heating and pressurization of shale. Explanation : The answer is "heating and pressurization of shale. Copyright Notice. View Tutors. Verneisha Certified Tutor.
Kimberly Certified Tutor. Amberton University, Master o Report an issue with this question If you've found an issue with this question, please let us know. Besides, another important difference between igneous rocks and metamorphic rocks is that metamorphic rocks are harder than igneous rocks. However, resistance to weathering and erosion is less in metamorphic rocks compared to igneous rocks.
Also, the tendency to react with acids is higher in metamorphic rocks when compared to igneous rocks. The key difference between igneous rocks and metamorphic rocks is that igneous rocks are the oldest rocks on earth while metamorphic are derivatives of igneous rocks and sedimentary rocks. John CC BY 2. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry.
I had forgotten the bit about Mega being stronger, but again, less resistant to weather, hence acid. I enjoyed the read, thanks. Your email address will not be published.
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