6. are areas on the ocean floor that experience active volcanism and are where p
ID: 299325 • Letter: 6
Question
6. are areas on the ocean floor that experience active volcanism and are where plates are pulled apart from one another a) Mid-ocean ridges b) Subduction zones c) Spreading centers d) Upper mantle e) Both A) & C) 7. The Solar System initially flattened into a due to the conservation of angular momentum. a) ball b) sphere c) disk d) doughnut 8. The planets are thought to have initial grown into planetesimals through a) accretion b) indentation c) condensation d) differentiation 9. Which are the 2 most abundant elements in the Universe? a) Hydrogen and oxygen b) Oxygen and helium c) Oxygen and hydrogen d) Hydrogen and helium 10. The physical property that describes an object's mass per unit volume is a) density b) buoyancy c) gravity d) weight 11. The underlying mechanism by which plate tectonics operates is a) differentiation b) accretion c) mantle convection d) inception Page 2 of 10Explanation / Answer
Answer to 6 is option C i.e. Spreading centres.At the time of active volcanism Spreading centres held on the ocean floor and plates move apart from one another. So the answer is Spreading centres.
Answer to 7 is option C i.e. Disk. The solar system flattened into a protoplanetary disk where dust sorrounds a star. due to the conservation of angular momentum.
Answer to 9 is option D i.e Hydrogen and Helium. The most abundant eliment of the universe is hydrogen and then the next is helium.
Answer to 10 is option A i.e. Density. An object's mass per unit volume is rcalled Density.
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