Rock N' Roll A journey into rock classification

Igneous rocks

Igneous rocks are formed through the cooling and solidification of magma or lava.

Intrusive igneous rocks form when magma cools slowly below the Earth's surface. Most intrusive rocks have large, well-formed crystals
Extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools quickly.

where are igneous rocks found?

Sedimentary Rocks

Sedimentary rocks are types of rock that are created by the deposition and cementation of material at the Earth's surface and inside bodies of water.

There are three types of Sedimentary Rocks. They are

Clastic, formed when broken pieces of other rocks are squeezed together, grouped by size of rock fragments
Organic, formed where the remains of plants and animals are deposited in thick layers, made up of parts of living things or made by living things
Chemical, formed when minerals that are dissolved in a solution crystallize or when a lake evaporates due to dry climate forming a large mineral deposit.

Where are Sedimentary Rocks Found?

Sedimentary Rocks are found in oceans, rivers and deserts

Metamorphic rocks

Metamorphic rocks are caused by a result of a transformation involving intense heat and pressure, causing physical/chemical changes.

Foiliated, which have a layered or banded look due to exposed heat and direct pressure
Non-foliated, which don't have a layered or banded look

where are metamorphic rocks found?

The coastline of Brazil is made up of metamorphic rocks.
Created By
Marie Ferrezza


Created with images by tpsdave - "oregon beach sand rocks" • James St. John - "Conglomerate" • James St. John - "Lignite coal (Tertiary; western USA)" • James St. John - "Diatomite" • James St. John - "Rhodochrosite (Oligocene, 27.6 to 30.6 Ma; Sweet Home Mine, Mosquito Range, Colorado, USA)" • James St. John - "Quartzite 1"

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