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- Intrusive and extrusive rocks are two main categories of igneous rocks123:
- Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground.
- Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.
- Examples of extrusive rocks include basalt and obsidian.
- Examples of intrusive rocks include granite and gabbro.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.www.nationalgeographic.org/encyclopedia/igneou…Intrusion is one of the two ways igneous rock can form. The other is extrusion, such as a volcanic eruption or similar event. An intrusion is any body of intrusive igneous rock, formed from magma that cools and solidifies within the crust of the planet. In contrast, an extrusion consists of extrusive rock, formed above the surface of the crust.en.wikipedia.org/wiki/Intrusive_rockExtrusive rocks, such as basalt and obsidian, are typically formed from lava flows or volcanic eruptions, which exposes them directly to the atmosphere or water, whereas intrusive rocks, like granite and gabbro, crystallize from magma that does not reach the surface, remaining encapsulated within the Earth's crust.www.askdifference.com/extrusive-vs-intrusive/ - People also ask
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WEBJan 11, 2021 · Extrusive igneous rocks form above the surface. The lava cools quickly as it pours out onto the surface ( Figure below). Extrusive igneous rocks cool much more rapidly than intrusive rocks. The rapid …
WEBExamples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that …
WEBIntrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth. Great globs of molten rock rise toward the surface. Some of the magma may feed volcanoes on the Earth's surface, but most …
WEBLearn the difference between intrusive and extrusive igneous rocks, which are formed by magma cooling rate. Intrusive rocks have visible crystals, while extrusive rocks have tiny crystals. See examples of intrusive …
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WEBThe key difference between intrusive and extrusive igneous rocks—the size of crystals making them up—is related to how rapidly melted rock cools. The longer melted rock has to cool, the larger the crystals within it …
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WEBJul 9, 2023 · Intrusive igneous rocks form when magma cools and solidifies beneath the Earth’s surface. The slow cooling that occurs there allows large crystals to form. Examples of this type of rock include granite, diorite, …
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