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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
Conglomerate is an example of _____________ rocks.
Fill in the blank
Sedimentary rocks such as limestone change into ___________.
What is crust?
Name any three elements of the earth’s crust.
Give two examples of sedimentary rocks.
Explain this term associated with rocks: Metamorphism
Distinguish between the following:
Calcarious and Carbonacious rocks.
Sedimentary rocks are also called stratified rocks. Why?
What are metamorphic rocks?
Classify the following rock: Limestone
Give one word for the following.
The best example of chemically-formed sedimentary rock, which has been formed by the evaporation of water from solution containing minerals.
Fill in the blanks
______ rocks are formed by the deposition of shells and skeletons of organism.
How are sedimentary rocks classified?
Give one term for the following statement:
Formed by evaporation in saline lakes.
Give reasons for the following
Rocks are of great economic significance.
Choose the incorrect statement from the following.
Lava comes out from a volcano.
The oldest sedimentary rocks of the world have been identified in ______.
| A | B | ||
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
