Monthly Archives: April 2008

Magmatic processes and igneous intrusions

Posted on April 26, 2008 by Rashid Faridi

  Magma What is magma? Properties of magmas Chemical composition What is magma? Magma is hot molten mobile rock. Igneous rocks form when magma cools and solidifies. Magmas come out of active volcanoes as lavas. The most abundant magma is … Continue reading →

Posted in earth, Earth Magnetism, interior of the Earth, Landforms, Volcanoes | Leave a comment

Metamorphism and metamorphic rocks

Posted on April 26, 2008 by Rashid Faridi

Introduction The word metamorphism comes from Greek and means ‘change of form’. Thus, metamorphic rocks are pre-existing rocks whose mineralogy and/or texture has been changed by processes within the Earth. Metamorphic rocks form because of changes in temperature and depth … Continue reading →

Posted in interior of the Earth | 2 Comments

Sedimentary Processes and Rocks

Posted on April 25, 2008 by Rashid Faridi

Sedimentary rocks form by the breakdown (both physical and chemical) of pre-existing rocks (these may be of igneous, metamorphic or sedimentary origin). The main factors that control this breakdown are: climate topography vegetation properties (physical and chemical) of the rock. … Continue reading →

Posted in earth, interior of the Earth, rocks | 5 Comments

Classification of Igneous Rocks

Posted on April 25, 2008 by Rashid Faridi

Igneous rocks are classified by using grainsize, silica content, and/or silica saturation. Other methods of classification include the International Union of Geological Sciences (IUGS) scheme and the Total Alkalies vs Silica scheme. Grain Size Based on the predominant grainsize that … Continue reading →

Posted in Uncategorized | Tagged , | 4 Comments