Question
Explain how sedimentary rocks are formed through the following processes.
i) Mechanical Process
ii) Chemical Process
i) Mechanical Process
ii) Chemical Process
Answer
i) Mechanical Process
- Particles are derived from existing rocks through process of weathering /Erosion.
- They are then transported by water/wind/ice and are deposited on land/large water bodies.
- They are deposited in layers.
- Over a period of time, they are compacted by pressure to form rocks such as alluvial, clay, sand, conglomerates.
ii) Chemical Process
- Minerals are dissolved from land and are carried in solution into bodies such as cakes/sea.
- The mixing of water of different types may result in chemical reactions followed by precipitation leading to accumulation at bottom of water body and are compressed into a rock
OR
- Dissolved minerals can also be precipitated directly from water through evaporation.
- This happens in very hot regions where there are constricted/shallow bays of lakes/seas, such rocks are known as evaporates.
- Particles are derived from existing rocks through process of weathering /Erosion.
- They are then transported by water/wind/ice and are deposited on land/large water bodies.
- They are deposited in layers.
- Over a period of time, they are compacted by pressure to form rocks such as alluvial, clay, sand, conglomerates.
ii) Chemical Process
- Minerals are dissolved from land and are carried in solution into bodies such as cakes/sea.
- The mixing of water of different types may result in chemical reactions followed by precipitation leading to accumulation at bottom of water body and are compressed into a rock
OR
- Dissolved minerals can also be precipitated directly from water through evaporation.
- This happens in very hot regions where there are constricted/shallow bays of lakes/seas, such rocks are known as evaporates.
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