0
== == Rhyolite, basalt, pumice, obsidian, andesite, dacite, tuff, welded tuff, scoria.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Some extrusive igneous rocks such as obsidian are glassy because they?
cool rapidly
How some extrusive igneous rocks such as obsidian are glassy is because they?
Cool rapidly
What types of rocks are formed above ground?
Extrusive igneous rocks and some sedimentary rocks are formed above ground.
Why do some igneous rocks have bubbles or pores and are these rocks intrusive or extrusive?
The bubbles and pores are from trapped gasses which expanded in the molten material as it neared the surface. They're usually found in extrusive igneous rocks, those that have solidified in the air or on the surface.
Some WHAT igneous rocks have individual mineral crystals that are too small to be seen without magnification?
Some extrusive igneous rocks have individual mineral crystals that are too small to be seen without magnification.
What kind of igneous rocks for on earths surface?
Some do. These are called extrusive igneous rocks. However a large portion of igneous rocks form beneath the surface. These are intrusive igneous rocks.
What is category of igneous extrusive rock?
Some igneous extrusive rocks include obsidian, basalt, andesite, rhyolite, scoria, pumice, basaltic glass. If you want more, go to page 6 on the Earth Science Reference Tables at the related link.
Which rocks would be formed above the surface of the earth?
Extrusive igneous rocks, some sedimentary rocks
Some igneous rocks cool at the surface and some cool underground. What are the names of these two types?
Underground = intrusive/plutonic aboveground = extrusive/volcanic
Some extrusive igneous rocks such as obsidian are glassy because they?
cool rapidly
How some extrusive igneous rocks such as obsidian are glassy is because they?
Cool rapidly
What types of rocks are formed above ground?
Extrusive igneous rocks and some sedimentary rocks are formed above ground.
Why do some igneous rocks have bubbles or pores and are these rocks intrusive or extrusive?
The bubbles and pores are from trapped gasses which expanded in the molten material as it neared the surface. They're usually found in extrusive igneous rocks, those that have solidified in the air or on the surface.
What rock would most likely be found near a volcano?
When lava reaches the surface of the Earth through volcanoes or through great fissures the rocks that are formed from the lava cooling and hardening are called extrusive igneous rocks. Some of the more common types of extrusive igneous rocks are lava rocks, cinders, pumice, obsidian , and volcanic ash and dust
Some extrusive igneous rocks such as obsidian are glassy because they are what?
They cool to quickly for crystals to form.
What rock types are formed above ground?
Extrusive igneous rocks and some sedimentary rocks are formed above ground.
What rock is a volcano rock?
Volcanic rocks are extrusive igneous rocks.
