to how igneous rocks are formed is given in their name; Igneous is Latin for “fire”. This basically means igneous rocks are cooled fire rocks from magma or lava‚ depending on where they cooled and formed. There are two categories of igneous rocks that also depend on where each was formed. Intrusive igneous rocks are igneous rocks that form when magma cools slowly and becomes solid underground. Extrusive igneous rocks are igneous rocks that quickly cool becoming solid at the crust surface due to
Premium Igneous rock Basalt Petrology
Allison Introduction My report is on Mt. Saint Helens. Before 1980‚ symmetrical Mt. Saint Helens was known as “Fujiyama of America.” (http://mountsthelens.com/history-1.html) Mt. Saint Helens erupted on May 18‚ 1980. It was one of the most deadly eruptions in America. Mt. Saint Helens height used to be 9‚677 ft making it the 5th highest peak in Washington. It’s height was reduced to 1‚300 ft after it exploded in 1980. Mt. Saint Helens is almost 53 km west of Mt. Adams and approximately 80 km Northeast
Premium Volcano Pacific Ring of Fire Lava
oceanic divergence after the rift valley had sunken below sea level‚ and is still growing today. Oceanic divergences develop quite differently‚ as the convection currents lift the ends of the plates‚ forming a ridge‚ and their opening fills with magma and cools; this then repeats itself. The most famous oceanic divergent boundary is the mid Atlantic ridge‚ the 10‚000 mile unseen mountain range that dominates as the longest of them all‚ making the Atlantic Ocean continually bigger‚ since the Triassic
Premium Plate tectonics
reverence from all. But yet‚ people show none. They have busy lives and don’t have time for "silly" things such as destructive volcanic eruptions. On top of that‚ they have all seen the movies in which people have effortlessly escaped the wrath of magma flow of "the rather gentle and atypical volcanoes in Hawaii." These people willingly‚ and sometimes unknowingly‚ make themselves easy prey for volcanic eruptions. But there is one group of people--people who have seen the horror that volcanoes wreak
Premium Volcano Earth Lava
north side‚ and ash in eleven states. Following the eruption a massive debris avalanche was triggered by an earthquake which it itself rated a five point zero on the Richter scale. This earthquake was said to have happened because of the surge of magma from the earths mantle. At once the volcanoes elevation was nine thousand six hundred and seventy-seven feet quickly became eight thousand three hundred and sixty-five feet where it is still currently at. Since this eruption Mt. St. Helens has been
Premium
pryoclastic flows of hot fragments and toxic gases the explosive nature comes from silica in the magma. The few other types of volcanoes are shield‚ cinder and complex (compound) volcanoes. One type of volcano is‚ Etna this volcano is also entitled a “strato volcano” it produces violent activity including lots of ash‚ lava and gas which causes danger to the population around any slopes nearby. Etna’s type of magma is high in silica when it occurs it’s accompanied by other large lava flows. 5. Deaths:
Premium Volcano
Broad and flat‚ plains are well named. Some appear when glaciers and streams erode away elevated terrain; others spread where rising magma pushes‚ erupts‚ and spews. Some plains spill into the oceans‚ and others are bound by mountains on several sides. They all hide a tumultuous geologic history beneath their level disguise. The base of the vast Great Plains in North America formed when several small pieces of continental crust collided and welded together more than a billion years ago. As time
Premium Basalt Sediment Erosion
This ash can be very harmful to the environment but on the long term‚ these ash‚ containing useful minerals will be converted into to a very fertile soil‚ useful for agriculture. The valuable minerals found are often associated with the magma. The rising magma from the volcano does not always reach the surface to erupt‚ instead‚ it will slowly cool down and harden to form different types of rocks. The tourism rate will increase mostly because of the volcanic eruption. Curious tourist that
Premium Volcano
Plate Tectonics Introduction Continental Drift Seafloor Spreading Plate Tectonics Divergent Plate Boundaries Convergent Plate Boundaries Transform Plate Boundaries Summary This curious world we inhabit is more wonderful than convenient; more beautiful than it is useful; it is more to be admired and enjoyed than used. Henry David Thoreau Introduction • • • Earth’s lithosphere is divided into mobile plates. Plate tectonics describes the distribution and motion of the plates. The theory
Premium Earth Plate tectonics Geology
Origin and spelling of the name The earliest mention of the island in the Western world was on a map by Lucas Janszoon Waghenaer‚ who labelled the island "Pulo Carcata." ("Pulo" is a form of pulau‚ the Indonesian word for "island".) There are two generally accepted spellings‚ Krakatoa and Krakatau. While Krakatoa is more common in the English-speaking world‚ Krakatau (or Krakatao in an older Portuguese based spelling) tends to be favored by Indonesians. The origin of the spelling Krakatoa is unclear
Premium Volcano