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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
Classify the following rocks by selecting the correct option given below:
shale
Classify the following rocks by selecting the correct option given below:
granite
Describe the process that leads to exfoliation.
Which agents are responsible for deposition of sediments?
Explain this term associated with rocks: Metamorphism
Name the main types of rocks.
How are chemically-formed sedimentary rocks produced?
How are chemically-formed sedimentary rocks formed? Give examples.
Classify the following rock: Dolomite
Give one word for the following.
Stratified rock formed organically but from vegetative matter-swamps and forests.
Give one word for the following.
The core of the earth occupied by rock in iron and nickel.
Fill in the blanks
______ rocks are formed by the deposition of shells and skeletons of organism.
How are sedimentary rocks classified?
______ is the kind of metamorphic rock using which Taj Mahal was built.
Distinguish between:
Internal Processes and External processes.
The two types of Intrusive Igneous rocks are ______.
The word Ignis means rock.
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
