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A texture that would most unlikely occur in an extrusive igneous rock is a coarse-grained or phaneritic texture. This texture, characterized by large, visible crystals, typically forms in intrusive igneous rocks where the magma cools slowly beneath the Earth's surface. In contrast, extrusive igneous rocks cool quickly at or near the surface, resulting in fine-grained or glassy textures, such as aphanitic or vitreous. Consequently, the formation of large crystals in extrusive rocks is highly improbable.
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What type of texture results when extrusive egeous rock cools so quickly that crystalization does not occur?
When extrusive igneous rock cools so quickly that crystallization does not occur, it results in a glassy texture. This texture is characterized by a smooth, shiny surface and the absence of visible crystals, as seen in rocks like obsidian. The rapid cooling typically occurs when lava erupts and comes into contact with water or air, leading to the formation of this unique texture.
What do you call magma once it has cooled and harden?
Once magma has cooled and hardened, it is called igneous rock. This process can occur either beneath the Earth's surface, resulting in intrusive igneous rock, or on the surface after a volcanic eruption, leading to extrusive igneous rock. Examples of igneous rocks include granite (intrusive) and basalt (extrusive).
Is mica extrusive or plutonic?
Mica is a mineral that can be found in both extrusive and plutonic igneous rocks. It is commonly associated with granite, a plutonic rock, where it forms as a result of slow cooling of magma. However, it can also occur in volcanic rocks, which are extrusive, where it crystallizes from lava that cools quickly. Thus, mica itself is not categorized as exclusively extrusive or plutonic; rather, it can be present in both types of igneous rocks.
Which rock is formed from melted minerals?
Igneous rock is formed from melted minerals that have solidified and cooled. This process can occur either beneath the Earth's surface, forming intrusive igneous rocks, or on the surface, leading to extrusive igneous rocks.
Which type of rock is produced by the cooling and solidification of molten rock?
Igneous rock is produced by the cooling and solidification of molten rock. This process can occur both beneath the Earth's surface, forming intrusive igneous rocks, and at the surface, forming extrusive igneous rocks.
Texture would be most unlikely to occur in an extrusive igneous rock?
A coarse-grained texture is unlikely to occur in an extrusive igneous rock because it forms quickly at or near the surface, limiting the time for large mineral grains to grow. Instead, extrusive igneous rocks typically have fine-grained to glassy textures due to rapid cooling.
What type of texture results when extrusive egeous rock cools so quickly that crystalization does not occur?
When extrusive igneous rock cools so quickly that crystallization does not occur, it results in a glassy texture. This texture is characterized by a smooth, shiny surface and the absence of visible crystals, as seen in rocks like obsidian. The rapid cooling typically occurs when lava erupts and comes into contact with water or air, leading to the formation of this unique texture.
What do you call magma once it has cooled and harden?
Once magma has cooled and hardened, it is called igneous rock. This process can occur either beneath the Earth's surface, resulting in intrusive igneous rock, or on the surface after a volcanic eruption, leading to extrusive igneous rock. Examples of igneous rocks include granite (intrusive) and basalt (extrusive).
What igneous rock is aphanitic texture?
These are igneous rocks that are too fine textured to an extent that there mineral grains or crystalline texture cannot be seen or distinguished with the necked or unaided eyes. They appear or occur as a whole single massive crystalline extrusive body of Igneous origin. Example is Obsidian.
Is mica extrusive or plutonic?
Mica is a mineral that can be found in both extrusive and plutonic igneous rocks. It is commonly associated with granite, a plutonic rock, where it forms as a result of slow cooling of magma. However, it can also occur in volcanic rocks, which are extrusive, where it crystallizes from lava that cools quickly. Thus, mica itself is not categorized as exclusively extrusive or plutonic; rather, it can be present in both types of igneous rocks.
Which rock is formed from melted minerals?
Igneous rock is formed from melted minerals that have solidified and cooled. This process can occur either beneath the Earth's surface, forming intrusive igneous rocks, or on the surface, leading to extrusive igneous rocks.
Which type of rock is produced by the cooling and solidification of molten rock?
Igneous rock is produced by the cooling and solidification of molten rock. This process can occur both beneath the Earth's surface, forming intrusive igneous rocks, and at the surface, forming extrusive igneous rocks.
What do you need in order for an igneous rock to form?
To form an igneous rock, you need molten material called magma or lava, which must cool and solidify. This process can occur beneath the Earth's surface (intrusive igneous rocks) or at the surface following a volcanic eruption (extrusive igneous rocks). Additionally, the cooling rate affects the rock's texture; slower cooling results in larger crystals, while rapid cooling produces finer-grained textures.
What does magma have to do with igneous rocks?
Magma is molten rock beneath the Earth's surface. When magma cools and solidifies, it forms igneous rocks. The cooling process can occur either slowly beneath the surface (intrusive igneous rocks) or rapidly on the surface (extrusive igneous rocks).
Is breccia intrusive or extrusive?
Breccia is typically classified as a sedimentary rock rather than intrusive or extrusive, as those terms refer specifically to igneous rocks. It forms from the accumulation and cementation of broken rock fragments and can occur in various environments, including impact sites or landslide deposits. While it can be associated with volcanic activity, it is not formed from the cooling of magma, which distinguishes it from intrusive and extrusive igneous rocks.
HOW does composition layering occur in igneous bodies?
A layered intrusion is a large sill-like body of igneous rock which exhibits vertical layering or differences in composition and texture.
Which rock type forms from the solidification of magma?
Igneous rocks form from the solidification of magma. This process can occur either underground (intrusive igneous rocks) or at the surface (extrusive igneous rocks), depending on the cooling rate of the magma. Examples of igneous rocks include granite, basalt, and obsidian.
