Continents and Oceans

Options:

1. It was widely accepted by geologists in the 19th century.
2. It was a departure from the orthodox geological ideas of the 19th century.
3. It was based on the thermal contraction theory of mountain building.
4. It was supported by differential gravitational force of buoyancy and the tidal force of the sun and moon.

Correct Answer

Options:

1. As an impartial scientific observer
2. As a lawyer
3. As a scientist who ignored evidence unfavorable to his ideas
4. As a scientist who distorted evidence in harmony with his theory

Correct Answer

Options:

1. The critics who search for errors and discrepancies in Wegener’s original synthesis and the scientists who attempt to modify his original theory.
2. The critics who search for errors and discrepancies in Wegener’s original synthesis and the scientists who attempt to discard his theory completely.
3. The critics who search for errors and discrepancies in Wegener’s original synthesis and the scientists who attempt to verify his theory.
4. The critics who search for errors and discrepancies in Wegener’s original synthesis and the scientists who attempt to discredit his personal life.

Correct Answer

Options:

1. The forces applied by Wegener are not sufficient to drift the continents so apart.
2. Both coasts of the Atlantic Ocean cannot be completely refitte
3. Wegener has not elaborated the direction and chronological sequence of the displacement of the continents.
4. All of the above.

Correct Answer

Options:

1. The whole mechanism of the evolution nature and motion of plates and resultant reactions
2. The rigid lithospheric slabs or rigid and solid crustal layers
3. The gliding of individual lithospheric plates over the surface of the globe
4. The process of plate motions

Correct Answer

Options:

1. The process of continental drift and displacement
2. The mechanism of plate motions
3. The gliding of individual lithospheric plates over the surface of the globe
4. The whole process of plate motions

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Options:

1. 6 major and 20 minor plates
2. 7 major and 15 minor plates
3. 5 major and 25 minor plates
4. 8 major and 18 minor plates

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Options:

1. H. Hess
2. W.J. Morgan
3. Canadian geophysicist J.T. Wilson
4. Mckenzie and Parker

Correct Answer

Options:

1. The concept of continental drift
2. The concept of sea-floor spreading
3. The concept of palaeomagnetism
4. None of the above

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Options:

1. Zones of convergence where two plates move towards each other
2. Zones of divergence where there is continuous upwelling of molten material
3. Zones where two plates pass or slide past one another
4. All of the above

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Options:

1. Accreting plate margins
2. Divergent plate margins
3. Shear plate margins
4. Consuming plate margins

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Options:

1. The oceanic crust was considered to be newly formed at mid-oceanic ridges and destroyed at the trenches
2. The continents and oceans move with the movement of these plates
3. The mechanism of plate motions based on Eulers geometrical theorem
4. None of the above

Correct Answer

Options:

1. All tectonic activities occur along the plate margins
2. Plate margins are where new oceanic crust is continuously formed
3. Plate margins are where two plates pass or slide past one another
4. None of the above

Correct Answer

Options:

1. H. Hess
2. W.J. Morgan
3. Canadian geophysicist J.T. Wilson
4. Mckenzie and Parker

Correct Answer

Options:

1. W.G. Vine
2. Mattheus
3. Professor Harry Hess
4. Mason

Correct Answer

Options:

1. W.G. Vine
2. Mattheus
3. Professor Harry Hess
4. Mason

Correct Answer

Options:

1. They were situated on the sinking thermal convection currents going down from the mantle
2. They were not related to sea floor spreading
3. They were situated on the rising thermal convection currents coming up from the mantle
4. They were created by volcanic eruptions on the ocean floor

Correct Answer

Options:

1. The molten lavas cool down and solidify to form new crust along the leading ends of divergent plates (oceanic crust)
2. The molten lavas cool down and solidify to form new crust along the trailing ends of divergent plates (oceanic crust)
3. The molten lavas cool down and solidify to form new crust along the middle of the oceanic plate
4. New crust is not created along mid-oceanic ridges

Correct Answer

Options:

1. Molten lavas that come up along the mid-oceanic ridges divide the earlier basaltic layer into two equal halves
2. Molten lavas that come up along the mid-oceanic ridges cause erosion of the existing basaltic layer
3. The magnetic anomalies are formed due to the presence of metals in the oceanic crust
4. The magnetic anomalies are formed due to the impact of solar winds on the oceanic crust

Correct Answer

Options:

1. On the basis of the number of magnetic stripes formed on the ocean floor
2. On the basis of the distance between two isochrons
3. On the basis of the age of the ocean floor
4. On the basis of the size of the mid-oceanic ridges

Correct Answer