0
Obsidian is a dense, dark volcanic rock formed from fast-cooling lava, resulting in a glassy texture, while pumice is a light, porous volcanic rock formed from frothy lava with trapped air bubbles, giving it a spongy texture. Obsidian is typically black or dark-colored, while pumice is usually light-colored due to its high porosity.
Add your answer:
Earn +20 pts
What are some names of extrusive igneous rocks?
== == Rhyolite, basalt, pumice, obsidian, andesite, dacite, tuff, welded tuff, scoria.
Which rock has large mineral grains granite obsidian basalt or pumice?
Granite has large mineral grains compared to obsidian, basalt, and pumice. Granite is an intrusive igneous rock that forms deep within the Earth's crust, allowing for the growth of large mineral crystals due to slow cooling. Obsidian, basalt, and pumice are extrusive igneous rocks that cool quickly at the Earth's surface, resulting in smaller mineral grains or a glassy texture.
What is a glassy rock?
Glassy rocks are rocks that have cooled and solidified quickly, without forming crystals. This rapid cooling prevents mineral crystals from growing, resulting in a smooth and glass-like texture. Obsidian and pumice are examples of glassy rocks.
How is granite different from scoria pumice and obsidian?
Granite is an igneous rock that is coarse-grained and mainly composed of quartz, feldspar, and mica. Scoria and pumice are volcanic rocks with vesicular textures due to gas bubbles. Obsidian is a natural glass formed from rapidly cooling lava without crystallization.
What do obsidian pumice rhyolite and granite have in common?
Obsidian, pumice, rhyolite, and granite are all types of igneous rocks that form from the cooling and solidification of molten material from within or on the earth's surface. They have different mineral compositions and textures based on their specific formation processes.
Is the metamorphic rock obsidian or pumice?
Neither. Both pumice and obsidian are igneous.
Why is a piece of pumice lighter than a piece of obsidian equal size?
Because pumice is lighter than obsidian always. That means obsidian weighs more than pumice.
Name 4 kinds of igneous rocks?
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
Why doesn't pumice or obsidian turn into a metamorphic rock?
Pumice and obsidian are both forms of volcanic glass, which weathers away fairly easily.
Is pumice and obsidian forms of volcanic gas?
Partially correct. Pumice forms from rapidly cooling lava containing volatiles (water and gas) and obsidian forms from rapidly cooling lava that doesn't contain volatiles. Bubbles from volatiles are frozen in place and cannot escape before the lava hardens forming pumice. Obsidian and pumice are sometimes found together although obsidian itself is relatively rare.
Is pumice and obsidian exaples of minerals?
Pumice is not a mineral; it is a type of volcanic rock with a frothy texture. Obsidian, on the other hand, is a naturally occurring volcanic glass and is considered a mineraloid rather than a true mineral because it lacks a crystalline structure.
What type of rocks are pumice obsidian and granite?
Igneous rocks
Name a volcanic rock?
Obsidian, basalt, andesite, pumice.
What does granite obsidian and pumice share?
They are all Igneous rocks.
What is the common name for obsidian rock?
The common name for obsidian rock is volcanic glass.
what is the difference of igneous rocks?
What do you mean? Do you mean intrusive or extrusive or the types of rocks themselves? Fine. Here's a list Basalt Granite Pumice Obsidian
What are some names of extrusive igneous rocks?
== == Rhyolite, basalt, pumice, obsidian, andesite, dacite, tuff, welded tuff, scoria.
