What is the Difference Between Metamorphic Rocks and Sedimentary Rocks?

The main difference between metamorphic rocks and sedimentary rocks lies in their formation processes. Here are the key differences between the two:

Formation: Sedimentary rocks are formed by the accumulation and cementation of sediments, such as sand, silt, dead plants, and animal skeletons, in water bodies like seas and oceans. On the other hand, metamorphic rocks are formed when existing rocks (sedimentary, igneous, or pre-existing metamorphic rocks) are subjected to intense heat, pressure, or reactive fluids, causing them to change their original shape and form.
Structure: Sedimentary rocks typically accumulate in layers, while metamorphic rocks can have either a foliated (has a definite planar structure) or nonfoliated (massive, without structure) structure.
Location: Sedimentary rocks are usually found in water bodies, while metamorphic rocks are found on the Earth's surface.
Examples: Common examples of sedimentary rocks include shale, limestone, and sandstone. Metamorphic rocks, on the other hand, include marble, slate, and quartzite.

In summary, sedimentary rocks are formed from the accumulation and cementation of sediments in water bodies, while metamorphic rocks are formed when existing rocks undergo changes due to heat, pressure, or reactive fluids. Sedimentary rocks have a layered structure, whereas metamorphic rocks can have either a foliated or nonfoliated structure. Sedimentary rocks are typically found in water bodies, while metamorphic rocks are found on the Earth's surface.

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What is the Difference Between Metamorphic Rocks and Sedimentary Rocks?

Comparative Table: Metamorphic Rocks vs Sedimentary Rocks

Here is a table highlighting the differences between metamorphic rocks and sedimentary rocks:

Feature	Sedimentary Rocks	Metamorphic Rocks
Formation Process	Formed by the accumulation of eroded substances, such as sand, silt, and dead plants or animal skeletons.	Formed when rocks change their original shape and form due to intense heat or pressure.
Location	Usually found in water bodies (sea, oceans, etc.).	Found on the Earth's surface.
Examples	Shale, limestone, and sandstone.	Marble, slate, and quartzite.
Structure	Often have pores between pieces.	Rarely have pores or openings.
Layering	Often have layers.	May have bent or curved foliation.
Hardness	Generally softer than metamorphic rocks.	Almost always harder than sedimentary rocks, sometimes as hard or harder than igneous rocks.

Guilherme Mazui

Guilherme Mazui is graduated in journalism from the Federal University of Minas Gerais (UFMG) and a master's degree in Communication from the University of São Paulo (USP). In addition, he has experience in advertising writing and has worked as a content editor in several companies.