Subduction zones are common sources of volcanoes. Explain the key details of the process of volcano formation along subduction zones
What will be an ideal response?
ANSWER: ?The subducting oceanic plate has a high water content. This water boils off as it descends and rises under the peridotite supporting the continental plate above. The water allows the magma to melt at a lower temperature. The peridotite melts to form basaltic magma, which is less dense than its surroundings and begins to rise. The rising basaltic magma can melt granitic rock to form rhyolite. Either the rhyolite, basalt, or intermediate andesite magma melts through to the surface to form a volcano.
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Based on the principle of Cross-Cutting Relations, which of the following statements are right?
a. If one geologic feature cuts across another, the feature that has been cut is younger b. Younger features cut older ones c. Cross cutting relations do not provide directly the relative age d. If a fault cuts across and displaces layers of sedimentary rock, then the fault must be younger than the layers. e. Both b and d
A hook shape may form on a spit because of
A) rip currents. B) wave refraction. C) wave deflection. D) erosion.
A Richter magnitude 6 earthquake has about double the ground motion compared to a Richter magnitude 5 earthquake.
Answer the following statement true (T) or false (F)
Reproducibility is an important part of the scientific method and means that
A. a control group is always used. B. other scientists are able to repeat the experiment and obtain similar results. C. scientists show all the calculations in their work. D. scientists have an idea that they are testing.