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because the crystal in the rock is very small
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Do extrusive rocks cool quickly?
Extrusive rocks do cool quickly because either the crystals in the rock are very small or there are no crystals at all.
Igneous rocks that cool quickly on earth surface are?
Igneous rocks that cool quickly on the Earth's surface are called extrusive or volcanic rocks. Examples include basalt, obsidian, and pumice. These rocks have fine-grained textures due to their rapid cooling.
Some extrusive igneous rocks such as obsidian are glassy because they are what?
They cool to quickly for crystals to form.
What is the igneous rocks that cool quickly on the surface?
Igneous rocks that cool quickly on the surface are known as extrusive or volcanic rocks. Examples include basalt, andesite, and rhyolite. These rocks have fine-grained textures due to their rapid cooling process.
Is an intrusive crystal bigger than an extrusive crystal?
Typically, intrusive crystals are larger than extrusive crystals because intrusive rocks cool slowly beneath the Earth's surface, allowing larger crystals to form, while extrusive rocks cool quickly at the surface, producing smaller crystals.
Explain 2 ways Igneous Rocks Form?
Igneous rocks form when magma cools and solidifies either underground (intrusive rocks) or on the Earth's surface (extrusive rocks). Intrusive rocks cool slowly, allowing large crystals to form, while extrusive rocks cool quickly, resulting in tiny crystals or glassy textures.
Do all extrusive igneous rocks contain crystals?
No, not all extrusive igneous rocks contain visible crystals. Some extrusive rocks, such as obsidian and pumice, cool so quickly that mineral crystals do not have a chance to form, resulting in a glassy texture instead.
Some extrusive igneous rocks such as obsidian are glassy because they?
cool too quickly for mineral grains to form, resulting in a non-crystalline structure.
Igneous rocks that result when lava solidifies are classified as what?
Igneous rocks that result from lava solidifying above ground are classified as extrusive igneous rocks. These rocks cool quickly, leading to small mineral grains and a fine-grained texture. Examples include basalt and rhyolite.
Does extrusive have fine grain or coarse grain?
Extrusive igneous rocks generally have a fine grain texture. This is because they cool quickly on the Earth's surface, causing the minerals to form small crystals.
Does an Extrusive Rock cool slowly?
No, extrusive rocks cool quickly because they form on the Earth's surface or in shallow depths where the temperature is lower. This rapid cooling results in small mineral crystals or a glassy texture in the rock.
What are types of extrusive igneous rocks?
Extrusive igneous rocks are igneous rocks that form above earth's surface. They are usually fine-grained due to the rate in which they cool.
