1. Evidence for the rearrangement of crustal plates and continental drift indicates that Australia was once part of an ancient super continent…
Effect of earths rotation tends to deflect air/water toward right in Northern hemisphere and left in Southern hemisphere…
is a significant geological discovery and it 's description is the first account of volcanic material in the Sydney Basin…
Iceland, the land of fire and ice, is a dramatic yet picturesque and beautiful landscape. Home to magnificent natural features such as glaciers, waterfalls and volcanoes, it is an incredible place to visit. The spectacular island is the second largest in Europe and located between the Greenland Sea and the Atlantic Ocean. It sits on a constructive plate boundary; the violent tug of war between the two plates causes Iceland to gradually get bigger. Iceland is the most volcanically active place in the world, due to tectonic plate activity. Disruptive eruptions occur about every five years. The most recent eruption of Eyjafjallajokull in April 2010, caused havoc both internationally and locally, in this essay I will be discussing which had a bigger impact.…
‘Evaluate how plate tectonics theory helps our understanding of the distribution of seismic and volcanic events’…
A volcano is an earth hazard that occurs on faults between tectonic plates on a destructive boundary and an eruption is a natural disaster. A primary impact happens immediately after the disaster and before any response like death or collapsing or destruction of buildings. A secondary impact occurs later after the disaster, such less farm produce or a reduction in tourism. The severity of these impacts will differ considerably in a MEDC and LEDC where volcanic eruptions have taken place. These may be seen in the Mount St. Helen volcano eruption as well as in the Iceland volcanic eruption. They may also show that the impacts vary from volcano to volcano, place to place.…
Undara Lava tubes consist of a lava field remaining from a massive volcanic eruption of Mt Undara which occurred 190,000 years ago. During the Cenozoic, there was wide spread igneous activity in Eastern Australia. Volcanism commenced in the late Cretaceous (approximately 70 Ma) and continued through the Cenozoic. The cenozoic is the current geological era. It began 66 million years ago and continues today. About 23.3 km³ of lava flowed from the Mt Undara volcano at an estimated rate of 1000 m³ a second. This lava flowed about over 160km to the north west and 90km to the north. The tubes were formed when these rivers of lava crusted over on the outside forming an insulated tube for the rest of the lava to flow along. Eventually the liquid lava…
(2012). Volcanoes and Volcanic Hazards. In Essentials of Geology (11th ed., p. 104, 105). Upper Saddle River, New Jersey: Pearson Prentice Hall.…
A volcanic or seismic hazard can have an effect on all people from differing economic backgrounds and the extent of the disaster if often directly linked to the magnitude of the earthquake or the areal extent of the volcanic eruption. This is therefore a result of the occurrence of type of plate boundary. A volcanic eruption produced at a destructive plate boundaries is likely to be much more devastating than at a constructive. This occurs because the volcano is usually composite and therefore expresses rhyolitic lava with low silica content and therefore erupts unpredictably and with great force. At this plate boundary, a denser plate (e.g. oceanic or and older plate) subducts a less dense plate (continental or newer) and this plate descends into the asthenosphere. The plate melts at the Benioff zone due to increased temperatures and pressures and stress is…
Volcanologists have named four stages of volcanic activity, Ape Canyon, Cougar, Swift Creek, and Spirit Lake. These stages are separated by dormant intervals. Little is known about the Ape Canyon stage (300-35 thousand years ago) (ka). During this stage, lava domes in two distinct periods, one from 300 to 250 thousand years ago (ka) and a second from 125-35 ka. Geologists have found layers of ash and rocks that were changed hydrothermally,…
Overview To all the residents in the village of Boomsdale, recently Dr. Bigbrain with the United States Geological Survey (USGS) has detected small earthquakes coming from Mt. Thunder. For those of you that do not yet know, Mt. Thunder is an active stratovolcano and these earthquakes could be related to an impending volcanic eruption. There are three types of volcanos which include: shield volcanos, scoria cone volcanos, and stratovolcanoes. Unfortunately, stratovolcanoes are the most dangerous, explosive, and deadly volcanoes. The reason for stratovolcano’s explosive tendency is because of the type of magma contained in the volcano’s magma chamber located underground beneath Mt. Thunder.…
Scientist Ben Kennedy begun a very lengthy quest to solve the mystery of the shrinking pumice. This quest would eventually change the way scientists think about volcanoes-forever. One of the things (out of many) that he and his colleagues found out while on the road was that not only the rock was shrinking, the pores that make up the rock were shrinking as well. They think that this was due to the heating of the rock, and the molten rock's surface tension. What the scientist found was how some volcanoes function on the inside. In past years, volcanologists believed that flowing lava sinks back down and settles after an eruption, pressing on the magma below and crushing all of the bubbles, which makes pressure build up under the compacted lava. This leaves the lava sitting there...Until it explodes. Pow! This hints at why some volcanoes will go through cycles of flowing and explosive eruptions.…
| |It's a truly fascinating subject, and this site attempts to frame the question of how to make a volcano within that larger context |…
Mauna Loa is a shield volcano. These volcanoes are usually composed of basalt, which enables them to possess a gentle slope, fluid and pahoehoe lava. The fluidity nature allows the volcano to not be deadly (“Geologic Hazards”, n.d.). The volcano consists of tholeiitic basalt (“Mauna Loa Volcano”, n.d.). Some of oldest rocks in the structure are from 100,000 to 200,000 years ago (“Mauna Loa Earth’s”, n.d.). It is currently on 19.475 N 155.608 W and 13,680…
Viewing an erupting volcano is a memorable experience; one that has inspired fear, superstition, worship, curiosity, and fascination throughout the history of mankind. The active Hawaiian volcanoes have received special attention worldwide because of their frequent spectacular eruptions, which can be viewed and studied with a relative ease and safety. The island of Hawaii is composed of five volcanoes, three of which have been active within the past two hundred years. Kilauea's latest eruption still continues as of today. Mauna Loa's latest activity was in 1984 and Hualalai's in 1800-1801, but is likely to erupt again within the next one hundred years. East Maui, or Haleakala, one of the oldest volcanoes, has a long eruptive history and recent activity indicates that the volcano will erupt in the near future. Last but not least, the Loihi Seamount, sometimes known as the "youngest volcano" is an undersea mountain this is still active. Scientists now believe that the hot spots lie in the ocean, deep beneath the volcanoes. These hot spots spew out of molten rock that rises to the water's surface and hardens. After doing this for a long time, the hardened lava forms an island, like the Hawaiian islands (Volcanoes Online).<br><br>The Kilauea volcano is one of the most active volcanoes on earth. It's current eruption started in January 1983, and there is no signs that the current eruption is slowing or will come to an end anytime soon. The U.S. Geological Observatory monitors the daily activities of the volcano, for example-movement of lava flows, earthquakes, surface deformation, and gas production. Kilauea has been monitored ever since, making it one of the better-studied volcanoes. Still there is much we don't understand about the inner workings of this volcano. Unlike most other volcanoes though, Kilauea is approachable. It has been called the "drive up" volcano because of the ease of access to many of its volcanic activity. On February 24, 2000, an article came…