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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
Why is coal hard and chunky?
Write True or False. Rewrite the false statement correctly :
Minerals are organic substances.
Write True or False. Rewrite the false statement correctly :
Rocks are used in construction industries.
What is the difference between the inner and the outer core?
Classify the following rocks by selecting the correct option given below:
schist
How are sedimentary rocks formed?
Mention any two characteristics of Sedimentary Rocks.
Name the rocks which are most widespread on the earth.
What are known as metamorphic rocks?
Briefly define Mechanical Metamorphism.
How are chemically-formed sedimentary rocks produced?
Give one word for the following.
Rocks formed by the cooling and solidification of molten rock from beneath the earth crust.
Why fossils are preserved in Sedimentary and not in Igneous rocks?
Find the difference between:
Igneous and sedimentary rocks
Rocks are classified into ______ types.
Oldest Sedimentary rocks of the world has been identified in Green land.
Explain about Petrology.
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
| A | B | ||
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
