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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?
What are metamorphic rocks?
What is Geology?
Give one difference between Extrusive igneous and Intrusive igneous rocks.
What processes are involved in the formation of Igneous Rocks?
Explain this term associated with rocks: Lithification of Rocks.
How are sedimentary rocks formed?
What is metamorphism?
Give a detailed account of lithiflcation of sedimentary rocks.
Classify the following rock: Shale
Classify the following rock: Loess
Classify the following rock: Graphite
Give one term for the following statement:
Formed by evaporation in saline lakes.
Why fossils are preserved in Sedimentary and not in Igneous rocks?
How is sand that flows in a river formed? Collect some information about where the sand comes from.
How are igneous rocks formed?
Which Soils are formed by the weathering of metamorphic rocks?
What is lava?
Explain Dynamic Metamorphism.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
