Q.Describe the characteristics and types of primary rocks.
How to approach: Identify every sub-question in the prompt, allocate dedicated sub-headings to each part, substantiate points with examples/data, and conclude with a forward-looking Way Forward.
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Primary rocks, commonly known as igneous rocks, are formed directly from the cooling and solidification of molten magma or lava. They represent the foundational rock type from which other rocks are derived, and their characteristics depend heavily on the composition of the molten material and the environment in which they cool.
Body
Characteristics of Primary Rocks
- Identification: They are identified by their distinct texture, density, color, and mineral composition. Their texture is determined by the shape, size, cooling duration, and crystalline arrangement within the rock.
- Absence of Fossils: Due to the intense heat of molten magma/lava during formation, fossils are not preserved in these rocks.
- Chemical and Physical Properties: They generally do not react with acids and tend to have a fine-grained, smooth texture.
- Hardness: They are typically hard and compact, making water percolation highly difficult.
Types of Igneous Rocks
- Intrusive Igneous Rocks: Formed when magma cools slowly deep beneath the Earth's surface, allowing large crystals to develop. Examples include granite and dolerite.
- Extrusive Igneous Rocks: Formed when lava reaches the Earth's surface and cools rapidly, resulting in fine-grained textures. Also known as volcanic rocks, examples include basalt and gabbro.
Conclusion
In conclusion, primary rocks serve as the fundamental building blocks of the Earth's crust, offering invaluable insights into the planet's geological evolution and internal processes.
Question Specifications, Marking Rubric & Syllabus Mapping
| Examination & Year | UPSC Civil Services Mains Examination 2022 (Question 1) |
|---|---|
| Paper & Syllabus Topic | General Studies Paper I — Heritage, History, Society & Geography → Physical, Human & Indian Geography |
| Marks, Word Limit & Ideal Time | 10 Marks • 150 Words • Ideal Writing Time: 7–8 Minutes |
| Directive Word & Core Demand | Analytical / Multi-Dimensional: Address all explicit sub-parts of the question with balanced arguments, factual illustrations, and a solution-oriented conclusion. |
| Recommended Structure Split | Intro: ~20–25 Words • Body: ~100 Words (3–4 dimensions) • Conclusion: ~20–25 Words |
| AI Practice & Evaluation Tools | Upload Handwritten Answer for 3-Min Vision AI Evaluation | Generate Custom Answer & Mind Map |
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Frequently Asked Questions — UPSC Mains 2022 GS1 (Geography)
How should I structure the answer for this UPSC Mains 2022 GS Paper I question on Geography?
This 2022 GS Paper I question carries 10 marks with a 150-word limit and uses the "Analytical / Multi-Dimensional" directive. Identify every sub-question in the prompt, allocate dedicated sub-headings to each part, substantiate points with examples/data, and conclude with a forward-looking Way Forward. Follow the ideal word split (Intro: ~20–25 Words • Body: ~100 Words (3–4 dimensions) • Conclusion: ~20–25 Words) and aim to finish within 7–8 Minutes.
Which UPSC Mains syllabus topic does this 2022 question belong to?
This question is part of General Studies Paper I — Heritage, History, Society & Geography under the syllabus module "Physical, Human & Indian Geography". You can explore all repeated questions from Geography in Acme AI's 3D PYQ Realm or filter all Geography PYQs on the Mains PYQ Directory.
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