The forces of nature as kids we all liked to skip rocks, but we never took time to understand the significance of them. Welcome to the website of rock classification.

Here on The forces of nature, you will find reliable information on the different types of rocks. On this website you will find videos and pictures of rock adventures and the different types.

Sedimentary Rocks

Sedimentary rocks are formed by the accumulation of different sediments.

Rock salt on the left and iron ore in the middle, and chert on the far right

Chemical sedimentary rocks: Chemical sedimentary rocks such as rock salt, iron ore, chert, and flint form when materials that have dissolved precipitate from a solution.

Metamorphic Rocks

Metamorphic rocks have been changed/ modified by chemical processes, heat, and lastly pressure. this happens when the rock is buried below the earths surface. There are two different types of metamorphic rocks.

Gneiss on the left and Hornfel in the middle, and schist on the far right

Foliated metamorphic rocks: The rocks gneiss, phyllite, schist, and slate have a layered appearance.

Non foliated metamorphic rocks: hornfels, marble, quartzite, and novaculite do not have a layered appearance.

Where are the rocks located?

Here's a color coordinated map to show you where you can find these rocks. The pink area is metamorphic which is located on the north side. igneous is located on the west side. And lastly sedimentary is located in the Midwest/east section of the map.

What is a rock cycle?

A rock cycle, is cycle of processes undergone by rocks in the earth's crust. it is also a model that shows the formation, and breakdown of a rock as a result of sedimentary, igneous, and metamorphic processes.

Igneous rocks

Igneous rocks are formed by the cooling and solidifying of materials. Igneous rocks can form beneath the Earth's surface, or at its surface as lava!

first rock is granite, middle is diorite last rock is pegmatite

Intrusive igneous rocks: intrusive igneous rocks crystallize beneath earths surface. and as it cools slowly it allows large crystals to form. examples of intrusive rocks are shown above, and i will list more. granite, diorite, pegmatite, gabbro,b and peridotite.

Extrusive igneous rocks: these rocks slowly erupt onto the surface while they cool quickly, and unlike intrusive rocks extrusive igneous rocks form smaller crystals. examples of these rocks are andesite, basalt, obsidian, pumice, rhyolite, scoria, and tuff.

What are the tools used to identify rocks?

As you know, geologists cant classify rocks with only the naked eye. they need the help of tools too! geologists classify rocks on how they form and what elements they have. the tools used to identify these rocks are called the three characteristics, mineral composition, color, and texture. for certain kinds of rocks geologists use origin, texture, and mineral composition. texture is the size and shape of the grains of the rock. mineral composition is a naturally occurring inorganic substance with a chemical composition and a crystal like structure/ form.

Created By
briana witt


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