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...courses and qualifications Rhyolite is a fine-grained extrusive igneous rock or volcanic rock. It is pale coloured, often light grey, tan or pinkish. Rhyolite is made up of quartz and feldspar crystals, and occasionally contains some mafic (dark coloured) minerals. Usually the crystals are too small to see without magnification, but occasionally contains larger crystals,...

...course Exploring Science... Exploring sedimentary processes A brief introduction to this album. From granite to sand How sand is formed by the weathering of moorland rock. Sand under the microscope What microscopic investigations reveal about samples of sand. Grains of sand Using sieves to establish grain size profiles. Transporting sand grains Comparing the effectiveness...

...course S339, Understanding the continents... Iceland: ridge, plume and basalt A short introduction to this album. Volcanism in the western riftzone Basalt, Icelands basic building block of the western rift zone Tectonic forces Evidence of Icelands crustal stretching. Volcanism in the eastern riftzone Examining Icelands 1480AD fissure eruption. New land on the Island of...

...on the net. It also explores who owns the information we publish when we create an online account. This material forms part of the Open University course TU100 My digital life... Why do the media need your help? Online media and freedom of information Does the online Generation have anything to worry about? Are we still legally considered citizens, when we’re online?...