What is scoria

What is scoria

http://geology.csupomona.edu/alert/Igneous/scoria.htm

Scoria is a light-weight, dark-colored, glassy, pyroclastic igneous rock that contains many vesicles (bubblelike cavities).

How scoria formed

http://saltthesandbox.org/rocks/scoriabasalt.htm

Scoria formed as lava exploded out of a volcano. Gas bubbles formed inside the lava, and were trapped as the lava cooled and hardened into rock

Is scoria intrusive?

http://wiki.answers.com/Q/Is_scoria_intrusive

no, extrusive because it is made by lava not magma.

Related Questions Answered on Y!Answers

Scoria….?

Q: What is the chemical composition of scoria?and, its physical properties.

A: A scoria is a cavity in igneous rock, caused by an escape of gas or steam. When such a cavity contains a mineral it is known as a amygdule.

Where can I purchase scoria or pumice?

Q: I am creating a green roof and have chosen either scoria or pumice as my substrate. Right now I can only find “lava rock.”I’m looking for enough to cover over 9,000 square feet.

A: http://www.loofahbytheinch.com/catalog/index.php?cPath=31

How are scoria rocks and granite rocks similar? How are they different?

Q:

A: Scoria rocks are igneous rocks which were formed when lava cooled quickly above ground. You can see where little pockets of air had been. Scoria is actually a kind of glass and not a mixture of minerals.Dam are you kids lazy!See how igneous rocks are formed atIgneous Animation page. http://www.fi.edu/fellows/fellow1/oct98/create/igneous.htm