What was the main counterargument against Wegener's evidence? (2 points) Wegener’s theory of continental drift was not accepted by all scientists.Ī. Shape of continents, fossil evidence, glacial evidence and similar rocks found in different continents.Ħ. What are four pieces of evidence Alfred Wegener used to support his theory of continental drift? (4 points) Make sure you label crust, subduction zone, magma, volcano, and the direction of plate movement. Draw a diagram to assist your explanation. Near these zones magma is brought up from the Earth, thus creates a volcanoe.ī. Well subduction zones are usuall found near convergent boundaries, which is a slab-pull. Why do you usually find volcanoes near subduction zones? (5 points) Volcanoes are usually found near subduction zones.Ī. Which is the stronger force behind plate movement? (2 points)Ĥ. Magma pushes it's way up to the crust, which pushes the crust apart.Įxample: There were slap-push earthquakes along Mexico and Chile.Ĭ. What is "slab-push"? Give one example of a slab-push structure. Gravity pulls down subducting crust, which pulls the crust along with it.ī. There are alternate explanations for the forces behind plate movement. Table filled in on a seperate piece of paper.ģ. Fill in the table with information about the different types of boundaries. Draw a diagram of Earth that labels its mechanical layers on one side and its composition layers on the other side. ISBN 7-X.7.3.2 Practice: Chronic Tectonics Practice AssignmentĮarth Science (S1392846) Kristina McClamrockĪnswer the following questions thoroughly.ġ. Earth Structure – An Introduction to Structural Geology and Tectonics. Holbrook (2002) Active Tectonics and Alluvial Rivers, Cambridge University Press Reprint edition, ISBN 8-6 Keller (2001) Active Tectonics: Earthquakes, Uplift, and Landscape Prentice Hall 2nd edition, ISBN 0-13-088230-5 Chichester, West Sussex: John Wiley & Sons. Tectonic landforms on large and small bodies in the solar system are as ubiquitous as impact craters. Since the 1960s, an armada of exploratory spacecraft have identified widespread evidence of tectonism on all the terrestrial planets, most of the satellites of the outer planets, and on a number of asteroids. Cambridge Planetary Science, ISSN 0265-3044 - Volume 11. The field of planetary tectonics extends the concept of tectonics to studying non-terrestrial bodies such as other planets and moons: Watters, Thomas R. The words tectonics and architecture are derived from the same Greek root, and tectonics is defined as the architecture of the Earth's crust. Geologists (as distinct from architects) may define tectonics as "the architecture of the Earth's crust". Other fields of tectonic studies Salt tectonics Most of the deformation in the lithosphere is related to the interaction between plates at or near plate boundaries. Convergent and divergent boundaries are also the site of most of the world's volcanoes, such as around the Pacific Ring of Fire. Convergent and transform boundaries are responsible for most of the world's major ( M w > 7) earthquakes. There are three main types of plate boundaries: divergent, where plates move apart from each other and new lithosphere is formed in the process of sea-floor spreading transform, where plates slide past each other, and convergent, where plates converge and lithosphere is "consumed" by the process of subduction. The lithosphere is divided into separate "plates" that move relative to each other on the underlying, relatively weak asthenosphere in a process ultimately driven by the continuous loss of heat from the Earth's interior. In plate tectonics, the outermost part of the Earth known as the lithosphere (the crust and uppermost mantle) act as a single mechanical layer.
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