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What condition would you expect a coarse-grained extrusive rock like dacite to form?
Coarse-grained extrusive rocks like dacite typically form under conditions of relatively slow cooling, which allows larger crystals to develop. This often occurs in volcanic environments where magma is expelled from a volcano and cools quickly upon reaching the surface, yet retains some degree of insulation, such as being trapped in a thick lava flow. The presence of gas bubbles and the viscosity of the lava can also influence crystal growth, leading to a textured appearance. However, true coarse-grained textures are more characteristic of intrusive rocks; dacite is generally fine-grained due to rapid cooling, suggesting a need for reconsideration of the classification.
What types of rocks are near active volcanoes and why?
When lava cools, it forms what is known as an extrusive igneous rock. Volcanoes are also associated with alteration from heat and fluids. Therefore you would expect to find extrusive rocks as well as altered rocks.
Why would you expect extrusive rocks produced by an explosive volcano to be light or dark in color?
Extrusive rocks produced by an explosive volcano are likely to be dark in color because they cool quickly on the Earth's surface, preventing mineral crystals from forming. This rapid cooling results in a fine-grained texture that appears dark in color due to the presence of minerals like olivine or pyroxene.
What kind of rocks would you expect to find near a volcano thathas erupted?
Extrusive, Igneous rocks possibly lavas or ignimbrites.
What type of rocks would you expect to find around a volcano crater?
You would find extrusive igneous rocks. Beyond that it depends on the volcano.
What condition would you expect a coarse-grained extrusive rock like dacite to form?
Coarse-grained extrusive rocks like dacite typically form under conditions of relatively slow cooling, which allows larger crystals to develop. This often occurs in volcanic environments where magma is expelled from a volcano and cools quickly upon reaching the surface, yet retains some degree of insulation, such as being trapped in a thick lava flow. The presence of gas bubbles and the viscosity of the lava can also influence crystal growth, leading to a textured appearance. However, true coarse-grained textures are more characteristic of intrusive rocks; dacite is generally fine-grained due to rapid cooling, suggesting a need for reconsideration of the classification.
Under which condition below would you expect a coarse grained extrusive rock?
You would expect a coarse-grained extrusive rock when the magma cools and solidifies slowly underground, allowing larger crystals to form due to extended cooling time. This can happen in magma chambers or in deep-seated volcanic environments where the magma has more time to cool and crystallize before reaching the surface.
What types of rocks are near active volcanoes and why?
When lava cools, it forms what is known as an extrusive igneous rock. Volcanoes are also associated with alteration from heat and fluids. Therefore you would expect to find extrusive rocks as well as altered rocks.
Why would you expect extrusive rocks produced by an explosive volcano to be light or dark in color?
Extrusive rocks produced by an explosive volcano are likely to be dark in color because they cool quickly on the Earth's surface, preventing mineral crystals from forming. This rapid cooling results in a fine-grained texture that appears dark in color due to the presence of minerals like olivine or pyroxene.
What kind of rocks would you expect to find near a volcano thathas erupted?
Extrusive, Igneous rocks possibly lavas or ignimbrites.
What type of rocks would expect to find around a volcano crater?
You would find extrusive igneous rocks. Beyond that it depends on the volcano.
What type of rocks would you expect to find around a volcano crater?
You would find extrusive igneous rocks. Beyond that it depends on the volcano.
What condition under below would you expect a coarse-grained intrusive rock like diorite to form?
Slow cooling in the upper mantle
Why would you expect the crystals in an intrusive rock to be larger than the crystals in the extrusive rock?
Because as an intrusive rock cools underground, it will normally cool more slowly than an extrusive (surface) rock. The slow cooling allows more time for the crystals to grow.
What is the highest level of qualification you expect to have before you start your course?
The highest level of qualification I expect to have before starting my course is a high school diploma or equivalent.
A student visits the area around a volcano that has recently erupted The student can expect to find samples of?
extrusive ingeneous rocks
What do you expect from your subject math?
Good results of course!
