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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.
What else can I help you with?
Does grain size mean anything when identifying igneous rocks?
yes, it does. when a grain size in an igneous rock is small, it means that it was probably an extrusive rock, meaning it formed on land. but if the grain size is big, it means that the rock most likely formed underground, or it was intrusive. try remembering it like this- the larger the crystals, the more time the rock had to form, and magma cools faster on land, not giving the rocks much time to form.
Is conglomerate intrusive or extrusive?
Neither. Conglomerate is a sedimentary rock. Intrusive and extrusive are descriptive terms used to classify igneous rocks.
What is the difference texture between phaneritic and clastic?
Phaneritic texture refers to igneous rocks with large, easily visible crystals that form when magma cools slowly beneath the Earth's surface, allowing individual crystals to grow. In contrast, clastic texture pertains to sedimentary rocks composed of fragments or particles derived from pre-existing rocks, which are cemented together. While phaneritic textures indicate a slow cooling process and a homogeneous mineral composition, clastic textures reflect the mechanical weathering and transportation of sediments, leading to a varied composition and grain size.
In which direction do you sand wood?
never sand wood across the grain always sand with the grain
Why is the surface of smooth sanded birch plywood cabinet doors rough after being painted with semi gloss paint?
The paint raises the grain of the wood. To avoid this: # moisten the surface with water. # allow to dry and thus raise the grain. # resand the wood using a fine grain sandpaper (220 grit). # repeat if the tightness of the grain is especially loose.
What is a factor that controls grain size in igneos rocks?
Crystal size in igneous rocks is controlled by the rate of cooling whereby the slower the rate, the larger the size of crystal.
Type of crystal grain that form when molten rock cools quickly?
Small crystal grains form when molten rock cools quickly. In an extrusive igneous rock, it's referred to as aphanitic texture.
Type or crystal grain that form when molten rock cools quickly?
Fine crystal grain.
What type of crystal grain is formed when molten rock cools slowly?
Large crystals with a coarse crystal grain texture.
What grain type is found in extrusive igneous rocks?
Extrusive igneous rocks are usually fine grained.
What is grain according to geologists?
Grain refers to particle or crystal size in rock.
What texture does and extrusive igneous rock have?
fined grain texture
Igneous rock are classified based upon their?
There are two types of igneous rocks; intrusive and extrusive. Intrusive igneous rocks are formed underneath the earth's surface from magma where it cools slower and develops large crystal structures. Extrusive igneous rocks are formed above the earth's surface from lava that cools quickly and creates rocks with smaller, finer crystal structures.
What does it mean for an igneous rock to have fine grain?
it means unfoliated that's my answer
What is grain size called?
Grain size refers to the diameter or dimensions of individual grains in a material, particularly in geology and materials science. In the context of rocks, it can indicate the cooling history of igneous rocks or the conditions of sediment deposition. The measurement of grain size is often categorized as fine, medium, or coarse, depending on the scale used. In metallurgy, grain size can influence the mechanical properties of metals, such as strength and ductility.
What effect does a fast cooling rate have on grain size in igenous rocks?
A fast cooling rate typically results in fine-grained texture in igneous rocks. This is because the minerals have less time to grow and crystallize, leading to smaller grains. Conversely, a slow cooling rate allows for more growth and results in larger grains.
How can you determine if a igneous rock has had an intrusive or extrusive origin?
== Grain size. Most intrusive igneous rocks will have visible crystals. Crystals in most extrusive igneous rocks are not easily visible.
