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What is it called when igneous rocks cool quickly?
obsidian
Some igneous rocks such as obsidian are glassy because they?
cool rapidly
Smooth glassy rock that is formed when lava cools?
Obsidian
Is basalt cooled slowly?
In reference to the cooling of magma into rock, basalt is formed from rapid cooling.
Name 4 kinds of igneous rocks?
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
What is it called when igneous rocks cool quickly?
obsidian
Some igneous rocks such as obsidian are glassy because they?
cool rapidly
Which two igneous rocks are formed by fast cooled lava?
Obsidian and Pāhoehoe lava
Some extrusive igneous rocks such as obsidian are glassy because they are what?
They cool to quickly for crystals to form.
Igneous rocks that cool quickly on earth surface are?
Igneous rocks that cool quickly on the Earth's surface are called extrusive or volcanic rocks. Examples include basalt, obsidian, and pumice. These rocks have fine-grained textures due to their rapid cooling.
Smooth glassy rock that is formed when lava cools?
Obsidian
Is basalt cooled slowly?
In reference to the cooling of magma into rock, basalt is formed from rapid cooling.
Some extrusive igneous rocks such as obsidian are glassy because they?
cool too quickly for mineral grains to form, resulting in a non-crystalline structure.
Name 4 kinds of igneous rocks?
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
What does obsidian mean in rocks and minerals?
Obsidian is black glass formed by volcanoes.
Why do obsidian rocks look dark?
because an obsidian rock has low silica
How obsidian rocks form?
They are formed when either a sedimentary rock or a metamorphic rock are exposed to high heat and turn into magma and then cool quickly.
