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Why do plutonic rock and volcanic rock have big and small crystals respectively?
The size of the crystals is a function of the rate of cooling of the molten rock. The faster the molten rock cools, the smaller the crystals will be.
Must all rocks form crystals?
All rock does not contain mineral crystals. Obsidian, or volcanic glass, in particular is a rock that has cooled so quickly from lava that mineral crystals were not able to form.
Hollow rock with crystals called?
A hollow rock with crystals might be called a geode. A geode is a type of sedimentary rock that has crystals formed inside due to volcanic heating and cooling or by other chemicals seeping into the rock.
What is the best place for crystals to form?
Volcanic tubes.
Which rock category includes types of volcanic rock?
Igneous rock.
Why do plutonic rock and volcanic rock have big and small crystals respectively?
The size of the crystals is a function of the rate of cooling of the molten rock. The faster the molten rock cools, the smaller the crystals will be.
Must all rocks form crystals?
All rock does not contain mineral crystals. Obsidian, or volcanic glass, in particular is a rock that has cooled so quickly from lava that mineral crystals were not able to form.
Why do plastic rock and volcanic rock have big and small crystals respectively?
Plutonic rock tends to have large crystals because it solidifies deep underground, where the overlying material insulates it so that it cools slowly, allowing time for large crystals to form. Volcanic rock tends to have small crystals (or to be amorphous) because it solidifies above ground, where air and water can cool it quickly by convection. Rapid cooling does not allow time for crystals to grow large. Plastic rock I don't know about.
Is volcanic glass an intrusive or extrusive igneous rock?
Volcanic glass is an extrusive igneous rock. It forms when molten lava cools quickly on the Earth's surface, preventing the formation of crystals.
Hollow rock with crystals called?
A hollow rock with crystals might be called a geode. A geode is a type of sedimentary rock that has crystals formed inside due to volcanic heating and cooling or by other chemicals seeping into the rock.
What does the presence of tiny crystals in a piece of igneous rock tell you about it?
The presence of tiny crystals in igneous rock indicates that the rock cooled quickly, resulting in the formation of small crystals. This suggests that the rock likely formed near or at the Earth's surface, like in a volcanic eruption. Rocks with larger crystals usually form deeper underground where cooling is slower.
Where would you expect to find an igneous rock with small crystals?
You would expect to find an igneous rock with small crystals near the Earth's surface where the rock cools relatively quickly, such as in volcanic eruptions or magma intrusions that do not have much time to grow large crystals. These rocks are known as volcanic or extrusive igneous rocks.
What type of rock had no visible crystals as result of rapid cooling?
Obsidian is an example of a rapidly cooled rock, also known as volcanic glass.
What type of rock forms when tiny crystals in magma form?
When tiny crystals form in magma, they create an igneous rock known as "intrusive" or "plutonic" rock. This occurs when magma cools slowly beneath the Earth's surface, allowing the crystals to grow larger, such as in granite. If the magma cools quickly on the surface, it forms "extrusive" or "volcanic" rock, like basalt, where the crystals are much smaller.
Is shale a volcanic rock with small crystals made when lava cools?
No, shale is a sedimentary rock formed from the accumulation of clay, silt, or mud particles that have been compacted over time. It is not formed from volcanic activity like lava. Shale typically has very fine-grained particles, not crystals.
What igneous rock has crystals that are not visible?
Extrusive igneous rock consists of mineral crystals that are not observable with the naked eye. Obsidian is an extrusive igneous rock (volcanic glass) where there technically are no mineral crystals.
What is a black volcanic rock with small crystals?
The black volcanic rock with small crystals is most likely basalt. Basalt is fine-grained and is commonly found in volcanic regions as a result of solidified lava flows. The small crystals are often composed of minerals such as plagioclase and pyroxene.
