Describe the nature and mode of origin of the main types of rock at the earth's crust.

Earth's crust mostly composed of core mantle and lithospheric, creating different type of rocks. Nature and origin of rocks: I Intrusive rocks (Igneous are Plutonic): Any at have volcanic origin and newly formed inside the earth's crust. Eg: Obsidian, Peridotite, Granite II Metamorphic rocks: They are rocks impacted by pressure, volume changes over the years are metamorphosed in form. Eg: Granite, Limestone etc. III Sedimentary rocks: These are the mechanical form of various one metamorphic rocks, created off after accumulation at vast land scale. Eg: Marble, Magskie etc. They rocks have unique origin and each have different properties significant for development of art and infrastructure.

III Sedimentary rocks: These are the mechanical form of various one metamorphic rocks, created off after accumulation at vast land scale. They rocks have unique origin and each have different properties significant for development of art and infrastructure.