Types of rocks & geological time
G-1.1.1Probable
0/5 stages complete · 0% coverage
Exam Strategy
UPSC tests rock classification (igneous, sedimentary, metamorphic) and geological time scale with emphasis on Earth's age, eons/eras/periods, and how rock types relate to landform development. Questions often pair rock types with specific landforms or mineral deposits, and may ask about radiometric dating principles.
High-yield hooks
1
Igneous from magma, sedimentary from layers, metamorphic from heat-pressure
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Hadean → Archean → Proterozoic → Phanerozoic eons
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Precambrian = 88% of Earth's history, Phanerozoic = visible life
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Granite (igneous) → weathered to sand → becomes sandstone (sedimentary)
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Geological time: 4.6 billion years, measured by radiometric isotope decay
Coverage — 0/9 done
0%
SCANGEOGRAPHY/GEOMORPHOLOGYGEOGRAPHY/LANDFORMS