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What does an igneous rock's crystal grain size indicate to the observer?
The size of the mineral crystals in an igneous rock is related to the rate of time spent in cooling from magma. Longer exposure to the crystallization temperature means larger crystals. Less time means smaller crystals, or in the case of obsidian, which cools extremely quickly, no crystallization.
Does lava cool quickly and form minerals with small crystals?
Yes. The faster lava cools, the less time crystals have to form. If the lava cools slowly and has a low viscosity, atoms are able to move around more and form larger crystals.
Why does lava harden?
Because it cools down and changes its state of mater.
How can lava start a forest fire?
the intense heat of lava eventualy breaks down trees and spreads quickly, and then you have a forest fire.
How does the metamorphic rock change into a igneous rock?
metamorphic rock melts into magma and volcano erupts. lava hardens and cools
When lava cools quickly large crystal form?
No. Small crystals form.
What is a 4 letter word for a type of crystal grain that forms when molten rock cools quickly?
lava
What happens when lava cools quickly but not instantaneously?
it explodes
Is rhis sentence true or false lava cools quicklyand forms minerals with small crystals?
It is true that lava cools quickly and forms minerals with small crystals.
What type of crystal forms when igneous rocks cool too quickly?
Actually, if lava cools quickly enough, there can be situations where no crystallization takes place at all. Such is the case with obsidian. Rapid cooling usually translates into small crystal formation.
What does lava that cools quickly form?
fast cooling lava -small crystals or no crystals
What lava that cools quickly form?
fast cooling lava -small crystals or no crystals
WHERE DOES LAVA COOLS QUICKLY?
Lava cools quickly when it comes into contact with water, such as in the ocean or a river, where it can solidify rapidly due to the contrast in temperature. Additionally, lava can cool quickly when it flows over ice or snow-covered terrain, causing it to solidify and form unique lava formations.
When lava cools very quickly it sometimes turn into a glassey rock called?
As lava cools once exposed to air or water, there may be no time for crystal formation, and it produces an almost glass like substance called obsidian. Obsidian is prized as a gemstone and in jewelry making.
Does andesite cool quickly or slowly?
Lava will cool quickly compared to underground magma.
Under which condition below would you expect a glassy extrusive rock like obsidian to form?
Obsidian is formed as extruded lava with a high silicon content that cools quickly. So the environment would be a volcano.
What rock is porous and lightweightna formed when lava cools quickly?
Pumice.
