Page 10 The best evidence we have for trying to find out the position of ancient
ID: 294329 • Letter: P
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Page 10 The best evidence we have for trying to find out the position of ancient continents, especially for the Precambrian, is provided by: a.) Professor Kramer's notebooks b.) Paleomagnetism c.) Fossils of marine plankton d.) Archeomagnetism e.) Fossils of land vertebrates 74.) The collision of lithospheric plates, especially collision of continents, is the primary cause of: a.) Continental drift b.) Mass extinctions c.) Mantle plumes d.) Mountain-building e.) Speciation 75.) The deepest parts of the oceans are the deep-sea trenches. How do they form? a.) Their formation is an unsolved mystery b.) They were formed by meteorite impacts on the sea floor c.) They formed by rifting along mid-ocean ridges d.) They are the topographic expression of subduction zones e.) They are the topographic expression of transform faults 76.) Why do volcanic eruptions occur in the states of California, Washington, and Oregon? a.) Wrong--although there are volcanoes in Washington and Oregon, there are none in California b.) An active continental rift, called the Cascadia Rift, can be found there c.) Because the San Andreas Fault is found in all three of these states, and there are many volcanoes along the northern portions of the San Andreas Fault d.) That is the location of a large mantle plume e.) The Cascadia subduction zone, where the Juan de Fuca Plate is being subducted, is just offshore 77.) What is the origin of the Hawaiian Islands? a.) Pele, the goddess of volcanoes, was very angry, and caused the eruptions that formed Hawaii b.) Volcanic activity associated with polarity reversals, coupled with movement of the Pacific Plate c.) Volcanic activity associated with sea-floor spreading, coupled with movement of the Pacific Plate d.) Volcanic activity associated with a mantle plume (hotspot), coupled with movement of the Pacific Plate e.) Volcanic activity associated with subduction, coupled with movement of the Pacific PlateExplanation / Answer
73) paleomagnetism
this is the magnetic record of old rocks, so the dirction of earths magnetism will have a particular direction at the place, so from this data we can find the initial position of continents.
74)mountain building
when two plates of equal densities collide each other, they form mountains by rising both the plates.
75)they are the topographic expressions of subduction zones.
when an old denser plate subduct beneath another plate, this region form a deeper region known as trench like mariana trench which is around 11Km deep
76)the cascadia subduction zone, where the Juan de Fuca plate is being subducted is just offshore.
the melting of subducted plate causes melting, and rises to the upper layer plate and form volcanos.
77) volcanic activity associated with a mantle plume(hotspot) coupled with movement of pacific plate.
when the pacific plate moves over the hot spot, volcanism begins and formed series of islands.
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