Q1
What are the three main rock types?
AIgneous, sedimentary, metamorphic
BOnly igneous
COnly sedimentary
DOnly metamorphic
SSCClass 6 (SSC)Geography (भूगोल)Ch 7 · Topic 1
Rocks and Rock Types
Rocks are classified into three main types - igneous, sedimentary, and metamorphic - each formed through different geological processes.
Core concept
Igneous rocks form when molten magma or lava cools and solidifies, like granite (formed underground) and basalt (formed from lava).
How it works
Sedimentary rocks form when layers of sediment (sand, mud, organic matter) are compressed over time, like sandstone and limestone.
Why it matters
Metamorphic rocks form when existing rocks are transformed by heat and pressure, like marble (from limestone) and slate (from shale).
Key detail
Understanding rock types helps us learn about Earth's geological history and how different landscapes and materials are formed.
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• Igneous rocks: cooled magma/lava.
• Examples: granite, basalt.
• Sedimentary rocks: compressed sediment layers.
• Examples: sandstone, limestone.
• Metamorphic rocks: transformed by heat/pressure.
• Examples: marble (from limestone), slate.
• Rock types show Earth's geological history.
• They explain landscape and material formation.