Rift zones are found only in the ocean basins. Rift zones are areas where oceanic crust is formed. Rift zones are the oldest parts of the oceanic crust. Rift zones mark the boundaries between oceanic and continental crust.
Which of the following is NOT true? Subduction zones are areas where ocean floor descends into the mantle. Subduction zone activity includes very large earthquakes. Subduction zone activity leads to active volcanoes. Subduction zones are areas where ocean floor rocks are formed. Subduction zones are marked as the deepest parts of the oceans. Transform faults show dominantly vertical movement. Transform faults are only in the ocean basins.
Transform faults are areas of spreading and new crustal generation. Transform faults change with time from horizontal to vertical motion. Transform fault motion typically ends abruptly at both ends. What does oceanic lithosphere consist of? Along which type of lithospheric plate boundaries are earthquakes common? Near which type of lithospheric plate boundary are andesite stratovolcanoes most common?
Why does oceanic lithosphere almost always sink beneath continental lithosphere at convergent plate boundaries? Oceanic lithosphere moves so slowly that it can only sink. Oceanic lithosphere is almost twice as dense as the underlying mantle.
Oceanic lithosphere is denser than continental lithosphere. Oceanic lithosphere is partly liquid, so it floats on the solid continental lithosphere. If the Atlantic Ocean floor is getting wider, why is the Earth not becoming larger? Actually, the Atlantic Ocean floor is not getting wider. Old ocean floor sinks at subduction zones trenches.
It is becoming denser, so it takes up no more space. It becomes part of the edge of the adjacent continent. It melts at oceanic transform faults. Why do many oceanic volcanoes occur as long lines of volcanoes that are active at only one end? The lithosphere moves over a stable hotspot in the mantle. The mantle convection cell under the crust carries the magma source from one end of the line of volcanoes to the other. The spreading lithosphere pushes the underlying magma source across the ocean floor.
The active volcanoes are gradually moving away from the oceanic ridge. The San Andreas Fault is: a. Along which type s of lithospheric plate boundary are basalt-flow eruptions abundant? What is a transform fault characterized by? The magnetic stripes of the seafloor are considered evidence of seafloor spreading and: a.
How does rhyolite magma form in the line of arc volcanoes like the Cascades? Rhyolite is not found in the Cascades volcanoes.
Basalt magma rising from above the subducted slab rises to melt continental crust to form the rhyolite. The subducted slab gets hot enough at depth that it melts to form rhyolite. Friction at the top of the subducted slab heats the mantle to form rhyolite. Why do the Hawaiian Islands form a chain of volcanoes? The mantle below flows slowly to the east, creating new volcanoes as it goes. The Hawaiian Islands are not part of a chain. They are over a stationary hotspot in the lithosphere. Their actual velocity varies with the properties of the materials through which the waves are propagating moving.
No part of this book may be reproduced, in any form or by any means, without permission in writing from the publisher. Keller, Duane E. DeVecchio ; with assistance from Robert H. Natural disasters. DeVecchio, Duane E.
Duane Edward , II. Blodgett, Robert H. View larger. The rates at which seismic waves propagate move are on the order of a few kilometers per second 1 or 2 miles per second. For example, and an 11, and old plates are recycled into the asthenosphere at subduction zones. A new plate is formed by upwelling and solidification of hazzards at divergent zon. Determining the probability that an event of a given magnitude will occur. Your Account. Natural Hazards: Earth Processes as Hazards, Disasters and Catastrophes , Fourth Edition, is an introductory-level survey intended for university and college courses that are concerned with earth processes that have direct, and often sudden and violent, impacts on human society.
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Hydrologists with the National Weather Service usually can predict when the river will reach a particular flood stage or water level. According to the theory of plate tectonics developed principally by Professor John Tuzo Wilson of the University of Toronto in the s, hazards, the relative motions of these plates are responsible for most earthquakes.
Identification of precursor events helps scientists predict when and where a major event is likely to happen. As population continues to. We nahural recognize your username or password. Submit Search. Considering that events we call natural hazards are natural processes that have been occurring on Earth for millions of years, how do you think we should go about trying to prevent loss of life from these events. The text integrates principles of geology, so? PDF On Jan 1, , akzamkowy.
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