Pumice is formed from frothy lava. Obsidian is not. Both have cooled rapidly from lava.
obsidian is smooth but not basalt
granite is extrusive rock
Granite
Volcanic glass often appears as pumice.
Intrusive:GraniteDioriteGabbroExtrusive:ObsidianBasaltRhyolite
Neither. Both pumice and obsidian are igneous.
No. Pumice and obsidian are rocks composed mostly of glass.
Because pumice is lighter than obsidian always. That means obsidian weighs more than pumice.
Pumice normally doesn't have any grains at all. It would be very unusual for it to have grains. Just like Obsidian, Pumice is cooled too fast to have any grains in it. One of the biggest differences between them is that Pumice is cooled with pockets of air while Obsidian has a glassy look.
Pumice and obsidian are both forms of volcanic glass, which weathers away fairly easily.
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
obsidian is smooth but not basalt
Volcanic glass, or pumice (vesicular obsidian).
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.
Obsidian, basalt, andesite, pumice.
They are all Igneous rocks.
Igneous rocks