become large enough for ocean to form. This is occurring today in the East African rift. Page 224 2.) Compare a continental volcanic arc and volcanic island arc. In a continental volcanic arc mountains formed in part by igneous activity associated with subduction of oceanic lithosphere beneath a continent. In contrast‚ volcanic island arc is a chain of volcanic islands generally located a few hundred kilometers from a trench where active subduction of one oceanic slab beneath another is occurring
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Volcanic and seismic events are major pieces of evidence towards proving that the plate tectonics theory is valid. The theory of tectonic plates was first posed by Alfred Wenger in 1912. Is the theory of how the earth lithosphere is made up of many separate pieces of the earth’s crust known as tectonic plates. He put forward the idea that all the earth’s continents were once conjoined in one supercontinent called Pangaea‚ and that these continents were moved by convection currents over a period
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The Cause of the Mass Extinction in the Late Cretaceous Period Dinosaurs first appeared around 245 million years ago‚ and they lived for 180 million years. Then suddenly‚ 65 million years ago they went extinct. Not only did all the dinosaurs die out‚ but also up "to 75% of all marine genera were lost" ("mass extinction"). This leaves scientists wondering about what could have led to this mass extinction in the Cretaceous Period. They have collected evidence from fossils and earth’s geography‚ to
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Earth because it is in constant motion‚ so the Earth’s surface is always changing; three Geo processes that change the surface of the Earth most are volcanoes‚ tsunamis‚ and earthquakes. Importantly‚ volcanic eruptions are caused by changes in the Earth’s crust. Just outside Rome‚ there are volcanic hills called Colli Albani. Below Colli Albani‚ the crust has been moving‚ allowing magma to flow up to the magma
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investments in housing development. Hong Kong has assigned a high percentage of investment to the development of housing‚ both in the public and the private sectors. There is also unplanned development in Hong Kong. Development are controlled by landforms. For example‚ roads are laid out along contours and conform to the shape of the waterfront. As such‚ many land lots are in odd shapes. Streets are narrow and there are few open spaces. Examples include Eastern Street‚ Western Street‚ High Street
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Mauna Loa is the biggest mountain in the world and one of the most active. It rises over 4 kilometers above sea level. Its coordinates are 19.4721 longatude and 155.5922 latitude. It is located in Hawaii. The 74.5 mile long volcano covers half of Hawaii. The massive volcano rises almost 2.5 miles above sea level. The volcano measures 56‚000 feet from its ocean floor base. One of the legends say that the goddess Pele was driven from her home by her sister. Every time Pele would thrust her digging
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extended through Western Asia to Northern Africa and Europe. As a result‚ the Ottomans were in need of geographical knowledge to determine the boundaries of their territory. To solve this‚ the Ottomans created advanced cartography techniques to depict landforms around them. The maps the Ottomans created included‚ “preliminary information about the New World depicting southwestern Europe‚ northwestern Africa‚ southeastern and Central America‚” showing how intricate and expansive the maps were (Ottoman Contributions
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------------------------------------------------- THE ANCIENT MINOANS The Minoans were an advanced civilisation‚ ready to take on the world. But their progressive empire was brought to a sudden end‚ their demise unknown to many archaeologists and scientists alike‚ UNTIL NOW. “The Minoan demise is hotly debated amongst the most reputable archaeologists and scientists’ of today” The Ancient Minoans were an advanced civilisation located on the island of Crete that was devastated firstly
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Convergent Plate Boundaries Convergent plate boundaries are locations where lithospheric plates are moving towards one another. The plate collisions that occur in these areas can produce earthquakes‚ volcanic activity and crustal deformation. Convergent Plate Boundary – Oceanic-Continental: When continental and oceanic plates collide the thinner and more dense oceanic plate is overridden by the thicker and less dense continental plate. The oceanic plate is forced down into the mantle in a process
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NATURAL DISASTERS Whitewater Rafting Whitewater rafting enthusiasts row or paddle rubber rafts down turbulent‚ fast-running rivers. Rafting trips can be short day trips or longer trips that involve camping alongside the river at night. Encarta Encyclopedia Energy Productions/The Image Bank Amazon River The Amazon River in South America is one of the longest rivers in the world. Only the Nile River in Africa is longer. Encarta Encyclopedia Claudia Parks/The Stock
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