Скачать или смотреть Rocks and Minerals/শিলা ও খনিজ/সম্পূর্ণ অধ্যায়/শিলাচক্র

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#rocksandminerals
Hi , This is Piali .As a Geography teacher I have described rocks and minerals in detail.

A mineral is a solid formation that occurs naturally in the earth while a rock is a solid combination of more than one mineral formation which is also occurring naturally.
Rocks are generally made up of two or more minerals, mixed up through geological processes. For example granite is an igneous rock mostly made from different proportions of the minerals quartz, feldspar and mica as interlocked crystals; a sandstone is a sedimentary rock that can also contain quartz, feldspar and mica, but as grains compacted and cemented into each other.
There are many different kinds of rocks which are grouped under three families on the basis of their mode of formation.

Igneous Rocks: Igneous rock is formed by the solidification of magma and lava. This is also known as the primary rock. Ex. Granite and Basalt etc.

Sedimentary Rocks: Sedimentary rocks are the result of deposition of fragments of rocks by exogenous processes. This is also known as the secondary rocks. Ex: sandstone, limestone, shale etc.

Metamorphic Rocks: Metamorphic Rocks formed from already-existing rocks that are undergoing recrystallization. Tertiary rocks are another name for metamorphic rocks. Ex: phyllite, schist, gneiss, quartzite and marble etc.

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inside our earth
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