Density of pumice and obsidian

Density of pumice and obsidian

E417/0371 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 25.0MB

Downloadable file size: 1.8MB

Price image Pricing

Please login to use the price calculator


Caption: Density of pumice and obsidian. Beaker of water containing a sample of pumice (floating, top) and obsidian (black), demonstrating the relative difference in their density. The two rocks are both types of extrusive igneous rock, formed by the rapid cooling of lava. They have a similar composition, both having a high silica (silicon dioxide) content. The difference in their density arises from the difference of their textures. Pumice is porous, having a vesicular texture (containing many holes). It forms from lava that contains gas bubbles. Obsidian is glassy because of the rapid rate at which it cooled.

Release details: Model release not required. Property release not required.

Keywords: 2, beaker, comparing, comparison, demonstration, dense, density, duo, earth science, experiment, extrusive, float, floating, geological, geology, glass, glassy, igneous, obsidian, pair, physical geography, porous, pumice, relative, rock, rocks, science education, silica, silicon dioxide, two, water

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.