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Arfat
- Rate $3
- Response 1h
$3/h
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- History
- Geography
- Political Sciences
I learned geography, history and political science with great care. If there is difficulty in understanding any chapter, I arrange extra class.
- History
- Geography
- Political Sciences
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About Arfat
About ARFAT SK
I'm a student studying at Berhampore college kalyani university, from West Bengal. I completed my bachelor's degree in Geography. Completed my 10th and 12th class from WEST BENGAL with 1St class first. I have been giving tuitions from the past 2 years. I love to teach and interact with new people. Teaching has always been my hobby and my passion
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About the lesson
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- English
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English
What Is A Rock?
A rock is a solid mass of geological materials. Geological materials include individual mineral crystals, inorganic non-mineral solids like glass, pieces broken from other rocks, and even fossils. The geological materials in rocks may be inorganic, but they can also include organic materials such as the partially decomposed plant matter preserved in coal. A rock can be composed of only one type of geological material or mineral, but many are composed of several types. Figure 6.2 shows a rock made of three different kinds of minerals.
Rocks are grouped into three main categories based on how they form. Igneous rocks form when melted rock cools and solidifies. Sedimentary rocks form when fragments of other rocks are buried, compressed, and cemented together; or when minerals precipitate from solution, either directly or with the help of an organism. Metamorphic rocks form when heat and pressure alter a pre-existing rock. Although temperatures can be very high, metamorphism does not involve melting of the rock.
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