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प्रश्न
How are sedimentary rocks formed?
उत्तर
Sedimentary rocks are formed from sediments accumulated over long periods, usually underwater on the floors of shallow seas, rivers, and lakes. These rocks are non-crystalline and are found in layers or strata and contain fossils. Conglomerate, sandstone, limestone, chalk, calcite, and dolomite are examples of sedimentary rocks. Sedimentary rocks are divided into various types depending on how they are formed.
- Mechanically formed sedimentary rocks :
These rocks have been formed by the accumulation of materials derived from other rocks which have been cemented together.
Examples – conglomerate (rounded fragments), breccia (angular fragments). - Organically formed sedimentary rocks :
These rocks have been formed by the accumulation of the remains of living organisms.
Examples – calcareous rocks such as limestone and chalk. - Chemically formed sedimentary rocks:
These rocks have been commonly formed by the process of evaporation of water containing salts in solution.
Examples – rock salt, gypsum, potash, nitrates, calcite, and dolomite.
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संबंधित प्रश्न
Rocks and minerals play a very important role in our lives.
Can you imagine modern life without minerals?
Fill in the blank
Sedimentary rocks such as limestone change into ___________.
What is Mechanical Metamorphism?
Give one example of an area of: Igneous rocks
Give reasons for the following
Rocks are of great economic significance.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
The two types of Intrusive Igneous rocks are ______.
______ rocks are also known as stratified rocks.
What is Thermal Metamorphism?
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
