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because the crystals gradually start to melt.
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∙ 12y ago
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How will cooling affect maple syrup crystal size?
Fast cooling=small crystals Slow cooling=big crystals
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 is the main factor that affects the size of minerals in igneous rocks?
Crystal size is largely dependent on the time the magma takes to cool and solidify. Slow cooling equals large crystals. Fast cooling equals small crystals.
Slow cooling of hot magma lead to the formation of what crystals?
large crystals
What size are the crystals on diorite?
Diorite, being an intrusive igneous rock, formed underground by slow cooling, would have crystals large enough to be visible.
How do the crystals in the pegmatites form?
slow cooling of gaseous magma
What does grain-size tell you about the cooling history of a rock?
Slower rates of cooling will create larger crystals. Rapid cooling allows little time for element accumulation in the crystal, therefore, the crystals created will be smaller. Larger, visible crystals in igneous rock indicate that the magma was slow cooling, usually at depth. Much smaller crystals in igneous rock indicate rapid cooling of lava, usually at or near the surface. Crystals in igneous rock will grow larger and have more time to accumulate material for their growth the more time they have at their crystallization temperature.
Does slow cooling of molten rock lead to formations of large crystals?
Slow cooling of molten rock leads to rocks with an phaneritic texture; one with larger, visible mineral crystals.
What determines crystal size in an igneous rock?
It depends on the cooling of lava. Slow cooling forms big crystals deep under the surface while fast cooling creates small crystals on or just below the earths surface. Itstant cooling wouls have no crystals.
What determines how large the crystals and an igneous rock Will be?
The speed at which the magma/lava cools ie. fast cooling = not much time for crystals to form = little or no small crystals slow cooling = much time for crystals to form = big crystals
What type of crystals is formed from slow cooling?
If the magma cools down fastly the crystal size is small because the crystals do not have much time to form. If They magma slows down slowly the crystal size is big because it gives the crystals time to form! :D
What rate of cooling produces the largest crystals in igneous rocks?
A slow rate of cooling. The slower a magma cools, the longer the crystals have to grow, thus the bigger they will be.
