Category Archives: interior of the Earth

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

Limestone Topography

Posted on April 25, 2008 by Rashid Faridi

Limestone caves Caves form in limestone (calcium carbonate), and occasionally in dolomite (calcium magnesium carbonate), when water containing dissolved carbon dioxide (carbonic acid) seeps into rock crevices and joints. The carbon dioxide comes from decaying organic matter in soil, and … Continue reading →

Posted in interior of the Earth | 3 Comments

Limestone Caves

Posted on April 25, 2008 by Rashid Faridi

Limestone has a peculiar quality in that whilst pure water cannot dissolve it rain water can because it has picked up carbon dioxide from the air and soil and turns the limestone into calcium bicarbonate. That process of dissolving becomes … Continue reading →

Posted in interior of the Earth, Landforms | 3 Comments