Q1
What are the three types of rocks?
AIgneous, sedimentary, metamorphic
BOnly igneous
COnly sedimentary
DOnly metamorphic
ICSEClass 7 (ICSE)GeographyCh 7 · Topic 1
Types of Rocks
Rocks are classified into three types - igneous, sedimentary, and metamorphic - based on how they form through different geological processe
Core concept
Igneous rocks form when molten magma or lava cools and solidifies, like granite (formed underground) or basalt (formed from lava).
How it works
Sedimentary rocks form from layers of sediment (like sand or mud) that get compacted and cemented together over time, like sandstone or limestone.
Why it matters
Metamorphic rocks form when existing rocks are transformed by heat and pressure, like marble (from limestone) or slate (from shale).
Key detail
Understanding rock types helps geologists study Earth's history and identify valuable resources like minerals and fossil fuels.
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• Rocks are igneous, sedimentary, or metamorphic.
• Igneous rocks form from cooled magma or lava.
• Examples: granite, basalt.
• Sedimentary rocks form from compacted sediment.
• Examples: sandstone, limestone.
• Metamorphic rocks form from heat and pressure.
• Examples: marble, slate.
• Rock types help study Earth's history and resources.