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Why is the texture of obsidian is best contain few or no minerals grains?
Obsidian cools so quickly the mineral grains do not have time to form.
When igneous rocks from a volcanic eruption cools what does it form?
When igneous rocks from a volcanic eruption cool, they can form either intrusive or extrusive rocks. Intrusive igneous rocks form when magma cools slowly beneath the Earth's surface, resulting in larger mineral grains. Examples include granite and diorite. Extrusive igneous rocks form when lava cools quickly on the Earth's surface, resulting in smaller mineral grains. Examples include basalt and pumice.
Do Glassy igneous rocks form when magma cools too fast for mineral grains to grow?
yes
Extrusive igneous rocks form when hardens and cools.?
Extrusive igneous rocks form when magma erupts onto the Earth's surface and cools quickly, resulting in small mineral grains. This rapid cooling prevents the growth of larger mineral crystals. Examples of extrusive igneous rocks include basalt and rhyolite.
Why does obsidian contain few or no mineral grains?
The material that would normally form mineral crystals does not have time to form a crystalline structure because of very rapid cooling after volcanically erupting into the air or onto the surface. Obsidian is a volcanic glass.
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.
Does melted rock that cools quickly result in igneous rock with large mineral crystals?
No, melted rock that cools quickly result in igneous rock with large minerals because large crystals take time to form and the rocks that usually have them are the ones that were formed inside the earth.
Glassy igneous rocks form when magma cools too fast for mineral grains to grow?
Yes, that's right. Glassy igneous rocks, like obsidian, form when lava cools rapidly, preventing the formation of crystals. This rapid cooling inhibits mineral crystal growth, resulting in an amorphous, glass-like texture.
What is an example of extrusive rock that has cooled too quickly for grains to form?
Obsidian, which is volcanic glass, is a good example.
What is the type of crystal grain that forms when molten rock cools quickly?
Small crystal grains form from rapid cooling of magma resulting in an aphanitic rock texture.
What igneous rock cools deep underground?
Granite is an igneous rock that cools deep underground. It is formed from the slow cooling of molten rock below the Earth's surface, allowing large mineral grains to form.
What kind of mineral does magma form when it cools?
When magma cools, it forms igneous rock.
