Question

6. Ridge push and slab pull are both thought to contribute to motion of the tectonic plates. What force drives ng push, slab pull, and convection of the asthenosphere in general A. Convection Cells generated by heat from the Earth's interior B. The Moon's gravitational pull c. Centrifugal force caused by Earth's rotation D. Magnetic forces that originate in Earth's core 7. A geologist makes a map showing the locations of current plate boundaries. The boundaries are most likely to coincide with: A. Tracks of hotspots B. Lines of latitude C. Edges of continents D. Locations of earthquakes 8. Unconformities in sedimentary rock strata indicate that: A. The layers of tilted rock strata must have initially been horizontal B. There is a gap in time periods during which no record of deposition was preserved C. The tilted layers of rock must be younger than the layers deposited horizontally D. Any similar layers separated across a valley must have been continuous when they were deposited . A student is going to a lecture about the Wilson cycle. What should the student expect to learn about? A. The cycle of uplift and erosion B. The cycle of rifting, breakup, subduction, and collision C. The cycle of melting, volcanism, erosion, deposition, and subduction D. The cycle of deposition, folding, thrusting, and relaxation of sedimentary layers 10. By the early twentieth century, geologists had numerous observations suggesting that in some parts of the world, the climates in the past had been very different from today's. Evidence included glacial deposits in areas that are now tropical and fossils of tropical plants in areas that are now very cold. What was German meteorologist Alfred Wegener's explanation for these observations? A. Earth's north and south poles wander over time. B. The tilt of Earth's axis changes slowly over time. C. Earth's continents are not fixed but instead move slowly over Earth's surface. D. New ocean crust forms at mid-ocean ridges while old cold ocean crust sinks back into the mantle.

Answer 1

Answer 6: Option A - Convection cells generated from the heat from the Earth’s interiors, is correct.

The Earth’s core reaches a temperature of more than 6000 degrees Celsius. This heat affects the mantle as well which is molten and is the layer above which the crust rests and moves. The convection cells in the mantle is what causes tectonic plates to converge (convergent boundaries where two plates move towards each other), diverge (divergent boundaries where two plates move away from each other at ridges) or slide past each other (transform boundaries) and this forms the basis of plate tectonics.

Why other options are wrong:

- The moon’s gravity, earth’s centrifugal force and magnetic force cannot explain the push and pull movement of plate tectonics.

Answer 7: Option 2- edges of continents, is correct.

Most of the tectonic plates are continental plates with some of them having their edges submerged a distance form the coast.

Why other options are wrong:

• Tracks of hotpots can occur anywhere where a mantle plume has risen into the crust.
• Lines of Latitude have nothing to do with plate boundaries.
• Location of earthquakes is restricted to convergent boundaries.

Please post other questions separately.