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no . they come from rapid cooling lava
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Rapidly cooling lava or magma forms very small 'blank'?
It forms very small crystals, not visible without magnification.
What feature in igneous rocks is the best indication of how rapidly the magma crystallized?
The size of the crystals. Large crystals mean the magma cooled slowly, small crystals are a sign that the magma was cooled quickly.
Do small crystals form when magma cools rapidly?
No, small crystals form when magma cools rapidly because there is not enough time for large crystals to grow. Rapid cooling results in a fine-grained texture, where smaller crystals have less time to grow before the rock solidifies. This is commonly seen in volcanic rocks like basalt.
Does rapidly cooled magma or lava contain small crystals?
Yes, rapidly cooled magma or lava typically results in the formation of small or no crystals due to the limited time available for crystal growth. This leads to the development of fine-grained or glassy textures in the rock.
Do Minerals that form in slowly cooling magma have small crystals.?
No, minerals that form in slowly cooling magma typically have larger crystals. This is because the slower cooling process allows more time for the atoms to arrange themselves into well-defined crystal structures. In contrast, minerals that form in rapidly cooling magma tend to have smaller crystals due to the quick solidification, which does not provide sufficient time for crystal growth.
What affects the size of crystals formed from magma?
The rate at which the magma cools affects the size of the crystals that form. If it cools slowly, large crystals will form. If it cools rapidly, small crystals will form.if it takes the rock a long time to cool down the crystals will be bigger if the rock takes a short time to cool the crystals will be smaller
How is the texture of an igneous rock related to the rate which it cooled?
Quick cooling of magma results in small crystal formation. Slow cooling magma results in larger crystals.
What does the presence of large and small crystals in igneous rock indicate?
The presence of large and small crystals in igneous rock indicates a varied cooling history of the magma from which the rock formed. Large crystals suggest that the magma cooled slowly, allowing time for the crystals to grow, typically occurring in intrusive (plutonic) environments. In contrast, small crystals indicate rapid cooling, which is characteristic of extrusive (volcanic) environments. This mixed texture may point to a complex cooling process, such as the mingling of different magma types or changes in cooling rates during the rock's formation.
Which type of rock that will have small crystals if cooled rapidly?
Igneous rocks will have small crystals if they cool rapidly. This is because rapid cooling does not allow enough time for large crystals to form. Examples of igneous rocks that exhibit small crystals due to rapid cooling include basalt and obsidian.
Why are mineral crystals in obsidian too small to see without a microscope?
Obsidian cools rapidly, preventing large crystals from forming. As a result, the mineral crystals are too small to be seen with the naked eye. The rapid cooling process hinders the growth of crystals, resulting in a smooth and glassy texture.
Explain pegmatite is coarse grained with large crystals basalt is fine grained with small crystals and obsidian has no crystals?
Crystal size in these rock types is determined by their rate of cooling. Pegmatites have large crystals due to very slow cooling. Obsidian has microscopic crystals due to almost instantaneous cooling.
What are Igneous rocks that have large crystals and small crystals?
Igneous rocks with large crystals are called intrusive rocks, formed from magma cooling slowly beneath the Earth's surface, allowing for large crystals to form. Igneous rocks with small crystals are called extrusive rocks, formed from lava cooling quickly on the Earth's surface, resulting in small crystals due to rapid cooling.
