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प्रश्न
What is meant by a rock?
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उत्तर
A rock is defined as an aggregate of one or more minerals that forms a part of the Earth’s crust. Rocks do not have a definite chemical composition like compounds but are usually mixtures of various minerals.
Most rocks are made up of silica, quartz, and feldspar. They may be crystalline, compact, or glass-like in nature. Examples of rocks include stone, clay, lava, sand, chalk, coal, and marble.
संबंधित प्रश्न
Fill in the blank
Sedimentary rocks are formed from _____________ accumulated over long periods.
Mention any two characteristics of Sedimentary Rocks.
What physical agents are involved in the sedimentary rocks?
Distinguish between Regional and Contact metamorphism.
Give one word for the following.
The lower part of ocean floor, comprising mainly of silica.
Give one term for the following statement:
Formed when mud layers compacted under great pressure composing 80% of this rock.
Give one term for the following statement:
Formed by evaporation in saline lakes.
Distinguish between Intrusive and Extrusive Rocks
Which types of rocks are predominantly found at the following locations?
- Central Maharashtra
- South Konkan
- Vidarbha
Fossils are found in.
What are metamorphic rocks?
The word ‘Igneous’ is derived from the ______ word.
The two types of Intrusive Igneous rocks are ______.
Lava comes out from a volcano.
______ rocks are also called Primary rocks.
The oldest sedimentary rocks of the world have been identified in ______.
Minerals exist in nature ¡n the form of ______ or ______.
Explain the different types of sedimentary rocks.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
