11. Planetary differentiation refers to the fact that all the planets are differ
ID: 295615 • Letter: 1
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11. Planetary differentiation refers to the fact that all the planets are different in some ways b) the gravity induced segregation of iron to form a core the different orbits the planets have around the sun d) the break-up of planets to form smaller rocky bodies. e) the accretion of material out of a galactic dust cloud to form planets 12. Large caldera eruptions occur as a result of a) long-continued spattering of lava b) contact of magma with ground water fissure eruptions d) violent degassing e) mysterious forces at work 13. Which of the following features arelis true concerning Earth's lithosphere? i. all earthquake foci occur here ii. the source of most volcanoes is here ii. it is actively trying to attain isostatic equilibrium with the asthenosphere iv. it contains the Moho v. it is the source of mantle plumes all of i to v are true a) b) only i, ii, ii, and iv are true c) only i and ii are true d) only iii and iv are true only v is true . Flowage of material within Earth's mantle controls (or markedly affects) every one of the following phenomena except a) earthquakes b) volcanism orogeny organic evolution e) none of the above they are all markedly affected. When the magnetic field of Earth undergoes a reversal, the a) Earth flips over in its orbit b) the sense of rotation of earth is reversed c) climate changes d) magnetization of all Earth's rocks change direction )) the magnetic polarity of Earth changesExplanation / Answer
11.Planetary differentiation means to separate two materials chemical or physical which creates core and mantle in the earth. So the answer is the gravity induced segregation of iron to form a core.
12. Large caldera eruptions are caused for buiding up pressure of magma under the rocks. When a large quantity of magma ejects, the empty chember can not support the weight of volcano and gas reformed. Thus Large Caldera eruptions occur as a result of violent degassing.
13.Lithosphere is the outer most part which is composed by crust and upper mantle. It's depth is 70-100 km from earth surface. As lithosphere is the earth surface mainly , earthquake foci occur here and it the soure of mantle plumes also. Hence the answer is a) all of i and v are true.
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