Granite is the most well-known and one of the most common intrusive magmatic (plutonic) rock type. It is formed when an intrusion of viscous magma with high silica content (68-75 wt %) remains under the surface of the earth, where it cools and crystallizes slowly inside the crust.
Granite is the equivalent of its extrusive (volcanic) rock type rhyolite. It is granular and coarse-grained in texture. Its principal minerals are feldspars, quartz, and mica.
Granites can be predominantly white, pink, or gray in color, depending on their mineralogy.
Colima volcano photos This beautiful stratovolcano in western Mexico is one of the most active volcanoes on the American continents. It is known for its often spectacular explosions and sometimes glowing avalanches.
Island of Venus Milos Island in Greece is one of the most beautiful and photogenic islands of the Mediterranean. Its boasts breathtaking scenery of colorful volcanic rocks, some of the finest beaches of the country, a rich archeological heritage, great hospitality and delicious local cuisine. Come join us to explore this magical island on a 6-days geological tour!
Worldwide earthquake activity level What is the level of global earthquake activity today compared to the past? Find out with our graph showing the current and past Global Seismic Activity Level indicator!
Worst earthquakes of the 20th century More than 1.5 million people lost their lives because of earthquakes in the 20th century. Check the list of damaging and deadly quakes from 1900-1999!
Overflowing lava lake Jan 2017 Our group on the volcano was lucky to be on site and witness the Erta Ale volcano overflow during its spectacular eruption in January 2017. Enjoy dramatic footage of this anazing event!
