Briefly explain how an accretionary wedge forms. What is meant by subduction erosion?
What will be an ideal response?
Along some subduction zones, sediments from the ocean floor and pieces of oceanic crust are scraped from the descending oceanic plate and plastered against the edge of the overriding plate. This chaotic accumulation of deformed sediment and scraps of oceanic crust is called an accretionary wedge. Subduction erosion is the process of sediment and rock being scraped off the bottom of the overriding plate and transported into the mantle by the subducting plate.
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Describe some of the measures that are being taken to reduce the problem of acid precipitation.
What will be an ideal response?
An earthquake that occurs in association with anthropogenic activity, such as waste water injection wells, is known as
A) tectonic seismicity. B) induced seismicity. C) a tectonic earthquake. D) an earthquake. (There is no special name for such an implausible event.)
The reason that treelines at the same latitudes north and south of the equator occur at different altitudes is ________
A) the varying solar radiation received by each hemisphere B) that there are few mountains in the Southern Hemisphere C) the Sun is usually higher in the sky in the Northern Hemisphere D) that there is more ocean in the Southern Hemisphere E) not completely understood
How did the landmass called Laurentia come together? What will be an ideal response?