The document discusses the three main types of rocks: igneous, sedimentary, and metamorphic. It describes how igneous rocks form from volcanic activity either inside the Earth as intrusive rocks or outside as extrusive rocks. Sedimentary rocks form from the compaction and cementation of sediments like sand and shale deposited over time. Metamorphic rocks are igneous or sedimentary rocks that have been altered by heat and pressure into a new form. The rock cycle shows how the different rock types are interrelated through geological processes.

1. Geography
Rocks
Nazima Tahseen K
Academic Coordinator
Velammal Bodhi Campus – Vellore
Posted on 4/2/2019

3. •Igneous Rocks
Formed from volcanic activity.

5. FORMATION
TYPES
Rock
IGNEOUS
ROCKS
INTRUSIVE
Magma
cools inside
EXTRUSIVE
Lava cools
outside

6. Intrusive igneous rocks

7. Extrusive Igneous Rocks

8. Sandstone
SEDIMENTARY ROCKS
SHALE

9. • Form when loose sediment (rocks,
sand) are deposited by water,
compacted, and cemented together.
• Form along beaches, by rivers, or
under the water in lake or oceans.

10. CONGLOMERATE BRECCIA
SEDIMENTARY ROCKS

11. Rock showing layers – Sedimentary rocks are layered

12. •Metamorphic rock
• Heat and pressure changes Igneous and
Sedimentary rocks to Metamorphic rock

18. • Rock Cycle

19. Presented by
Nazima Tahseen K
Mcom.,Mphil.,B.Ed.,GNIIT.,PGDCA.,
MA(Eng).,MA(His).,BA(Hin)