‘Evaluate how plate tectonics theory helps our understanding of the distribution of seismic and volcanic events’ In 1912‚ Alfred Wegener published his theory that a single super continent named Pangaea once existed about 300 million years ago. He proposed that Pangaea then later split into two continents of Laurasia in the north and Gondwanaland in the south and that today’s continents were the result of further splitting of these two land masses. Where the plates split are known as plate boundaries
Premium Plate tectonics
Makran coast and is believed to be of the same nature as the West Coast fault along the coast of Maharashtra‚ India. An active subduction zone exists off the Makran coast. The great 1945 earthquake was centred in this region. This zone forms the boundary between the Arabian and the Iranian micro-plate‚ where the former subducts or dives beneath the latter. Thrust zones run along the Kirthar‚ Sulaiman and Salt ranges. There are four faults in and around Karachi and other parts of deltaic Indus‚
Premium Pakistan Sindh Indus River
various customers around the globe in remote places to save on costs of piping these reserves and also for surveillance purposes like detecting missiles. Japan is situated in a complicated plate boundary region where three subduction zones meet. Two of these subduction zones run parallel to the east coast of Japan. To the south‚ the Philippine plate is being subducted beneath the Eurasian plate‚ whilst to the north; the Pacific Plate is being subducted beneath the North American plate. These rocky
Premium Plate tectonics Earth Earthquake
Gondwanaland‚ Science 905 Section I In the late nineteenth century‚ on the basis of comparative geological evidence‚ the Austrian geologist‚ Edward Suess‚ founded a theory that a single supercontinent‚ which he called Gondwanaland‚ an ancient landmass that consisted of the present continents of South America‚ Africa‚ Australia‚ and Antarctica as well as the Indian subcontinent. Gondwanaland is believed to have been intact at least twice‚ about 350 million years ago and about 200 million years ago
Premium Plate tectonics Pangaea
and familiarize yourself with past Plate Movement and the supercontinent Pangea -to understand the Hot Spots of Hawaii and Yellowstone Part 1. Types of Plate Boundaries There are 3 types of plate boundaries and a fourth called a “plate boundary zone” in which the type of plate boundary is not clearly defined. Go to the website: http://pubs.usgs.gov/publications/text/understanding.html and learn about the three types of plate boundaries and answer the questions below. 1. What are the three
Premium Plate tectonics
that describes the formation of Earth’s early crust. a) 1. upper mantle cooled and crystallized 2. sediments formed 3. sediments drawn down into subduction zones 4. Partial melting of sediments and subducted slab 5. Magma with new chemical composition formed 6. Granite crust formed as magma crystallized 7. Subduction continued forming more magma 8. crust weathered 13) Explain how geologists have determined the age of Earth? a) Radio metric dating has determined that
Premium Earth Plate tectonics
Restless Earth Key Terms... Key Term Meaning Anticline A fold that is convex up and has its oldest beds at its core. Ash cloud A large cloud of smoke and debris that forms over a volcano after it erupts. Collision zone When 2 continental plates collide. Neither plate is forced under the other‚ nor so both are forced up and form fold mountains. Composite volcano Composite volcanoes are made up of alternating layers of lava and ash (other volcanoes just consist of lava). They are usually found at
Free Plate tectonics
a volcano. Volcanoes can also occur at tectonic plate boundaries because Volcanoes form where the earth’s crust is thin and the magma can flow to the surface easier. This happens mostly at the edge of the plates. Volcanoes lastly can occur at subduction zones because that is where the crust is being forced down into the lower levels and becomes magma also becomes higher pressure as it moves down something must move up to balance out‚ the magma moves up forming a volcano. Volcanoes can occur in many
Premium Volcano Lava Plate tectonics
plates move within the lithosphere‚ which is the outermost shell of the planet. The lithosphere has more strength than the underlying asthenosphere allowing the tectonic plates to move. Seafloor motion away from the spreading ridge and drag at the subduction zones is a theory for plate movement. The tidal forces of the sun and moon and the forces generated by the rotation of the globe is another idea for plate movement. There are other hypotheses on plate movement but these are the two main scientific
Premium Plate tectonics Earth Volcano
Study Questions SUBJECT: Plate Tectonics 1. What occurs at subduction zones? Draw a cross section of oceanic plate subducting beneath a continental plate (Nazca beneath South America). 2. What is the lithosphere and what are the major lithospheric plates? 3. What are the various features and processes that define plate boundaries? 4. What processes occur at mid-ocean ridges and why? 5. What is a shear zone (transform)? 6. What is a hot spot (geologically speaking)‚ what
Premium Plate tectonics