Sedimentary Rocks

Sedimentary Rock are types of rocks that are formed by the deposition and subsequent cementation of that mineral at the earth's surface and within bodies of water. There are clastic sedimentary rocks, chemical sedimentary rock, and organic sedimentary rocks.

Clastic Sedimentary Rocks

A shale rock is a rock that contains significant amounts of organic material in the form of kerogen.

These rocks are formed from mechanical weathering debris. Clastic fragments are classified according to grain size. The fragments are deposited in horizontal layers called beds or strata.

Chemical Sedimentary Rocks

Rocksalt is a chemical sedimentary rock that forms from the evaporation from ocean lake waters.

A chemical Sedimentary rock are formed when water evaporates and the sediments in the solution crystallize out and are deposited. Precipitation(setting out) of minerals from a solution. Sedimentary rocks formed by this process are usually called monominerallic.

Organic Sedimentary Rocks

Bituminous Coal is a relatively soft coal containing a tarlike substance called bitumen.

Organic sedimentary rocks are made of accumulated remains of shell-forming organism,or coal-forming plants. They typically contain fossils or imprints of organisms that were once living.

Where are they found?

Sedimentary rocks are mostly common to find.

Sedimentary rocks form when mud and sand are deposited in layers on the Earth's surface. The layers are deposited in many environments including oceans, rivers and deserts. These layers of sand and mud are later buried. They can be founded around the world.

Rock Cycle

This is how they are form. The arrows indelicate how they are formed by using pressure and cementation.

Igneous Rocks

Igneous rock or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. Igneous means "fire-formed". Rocks that form molten rock that solidifies(harden) are called igneous.

Extrusive Rocks

Obsidian Rock is a naturally volcanic volcanic glass formed as an extrusive rock.

Extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools quickly. Most extrusive (volcanic) rocks have small crystals. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass.

Intrusive Rocks

Granite is a light-colored igneous rock with grains large enough to be visible with the unaided eye.

Intrusive, or plutonic, igneous rocks form when magma cools slowly below the Earth's surface. Most intrusive rocks have large, well-formed crystals.

Where are they found?

They are found all over the US.

Igneous rock is a rock formed by the hardening and crystallization of molten material that originates deep within the earth.

Rock Cycle

This is how they are formed. They have a lot of steps to get a igneous rock


Metamorphic Rocks

A metamorphic rock is a result of a transformation of a pre-existing rock. The original rock is subjected to very high heat and pressure, which cause obvious physical and/or chemical changes.Metamorphic rocks have been modified by heat, pressure, and chemical processes, usually while buried deep below Earth's surface. Exposure to these extreme conditions has altered the mineralogy, texture, and chemical composition of the rocks.

Foliated(Regional) Metamorphic Rocks

Gneiss is a foliated metamorphic rock that has a banded appearance and is made up of granular mineral grains.

Foliated metamorphic rocks such as gneiss, phyllite, schist, and slate have a layered or banded appearance that is produced by exposure to heat and directed pressure.Foliation forms when pressure squeezes the flat or elongate minerals within a rock so they become aligned. These rocks develop a platy or sheet-like structure that reflects the direction that pressure was applied in.

Non Foliated(Contacted) Rocks

Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone.

Non-foliated metamorphic rocks such as hornfels, marble, quartzite, and novaculite do not have a layered or banded appearance. These rocks typically cooled very slowly, allowing the minerals within them to form large, uniform crystals that are tightly packed together.

Where are they found?

This is where they are found. They are mostly found in eastern side.

Rocks can be metamorphosed simply by being at great depths below the Earth's surface, subjected to high temperatures and the great pressure caused by the immense weight of the rock layers above.

Rock Cycle

This is how they are formed.
Created By
Yannes Martinez


Created with images by eldh - "Rocks."

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