The eruption of Mount Pinatubo in 1991 was the second largest volcanic eruption of the 20th century. The eruption released a huge volume of volcanic ash and sulfur dioxide into the atmosphere. This caused the planet to e... More »

www.reference.com Science Earth Science Volcanoes

In March 1991 and April 1991, magma rising 20 miles beneath the surface of the Pinatubo volcano caused many earthquakes and small explosions, which destroyed parts of the volcano. Then on June 12, 1991, magma filled with... More »

Pumice rock is found all over the planet and on every continent. This textured rock is formed when volcanoes erupt, and it is carried from shore to shore after being generated by underwater volcanoes. The molten rock com... More »

Mount Pinatubo is a stratovolcano. Stratovolcanoes are the most deadly type of volcano, and they are recognizable by their sharp rise and steep slopes. More »

www.reference.com Science Earth Science Volcanoes

Mount Pinatubo is an active stratovolcano, or a cone-shaped volcano, that is made from many layers of hardened ash, lava and other volcanic rock. Stratovolcanoes are also called composite volcanoes. More »

In March 1991 and April 1991, magma rising 20 miles beneath the surface of the Pinatubo volcano caused many earthquakes and small explosions, which destroyed parts of the volcano. Then on June 12, 1991, magma filled with... More »

The catastrophic Mount Saint Helens volcanic eruption that took place on May 18, 1980 was the result of several factors that began with an accumulation of magma within the mountain's edifice earlier that year. A resultin... More »