Petrology or lithology is a branch of geology that is dedicated to studying rocks, especially their physical, chemical and mineralogical properties, but also studies rock associations and the respective formation processes. This fascinating science encompasses the study of both igneous rocks and sedimentary rocks and metamorphic rocks. In relation to what has just been described, volcanic rocks are the subject of study in petrology. This type of rock, also called effusive rocks or extrusive rocks, is broadly one of the products that arise from volcanic eruptions.
After this brief introduction, we highlight that this post by Green Ecologist is appropriate if you want to learn everything about what are volcanic rocks, their types and characteristics. Also here you will find in detail the differences that exist between volcanic rocks and plutonic rocks.
To better understand this article, we first need to review the difference between magma and lava. Magma is the mass of rock molten from the center of the Earth, while lava is the magma that, during a volcanic eruption, reaches the Earth's surface.
Now, as for what volcanic rocks are, we can detail that they are defined as a type of igneous rocks, which originate thanks to cooling and solidification of lava on the earth's surface or magma that is close to the surface. Therefore, volcanic rocks are particularized by having formed from a rapid cooling and, at times, abrupt. This phenomenon results in volcanic rocks being composed of small crystals called microcrystals.
To further clarify these concepts, we recommend you read our articles:
Volcanic rocks can be classified in multiple ways, by their abundance, size and even by the type of crystal they are formed. According to the texture of the rocks and the size of the crystals that compose them, the classification of volcanic rocks is the next:
Now that we have talked about what volcanic rocks are and their types and characteristics, it will be easy for us to understand the difference between these and plutonic rocks. Before we start with the differences, we must know that both types of rocks are igneous rocks, that is, rocks that originate from the cooling and solidification of magma near the surface or lava already outside. The main differences between rocks are around the place where they originate and the time in which they cool. Other differences are related to their respective location. Let's see here:
We recommend that you also read this other post that will help you better understand the topic of igneous rocks: types, characteristics, classification and examples.
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