Q. Which of the following forces was not cited by Alfred Wegener to explain his ‘Continental Drift Theory’?
Q. Which of the following forces was not cited by Alfred Wegener to explain his ‘Continental Drift Theory’?
The correct option is B Convectional Current
Explanation:
Wegener suggested that the movement responsible for the drifting of the continents was caused by pole-fleeing force and tidal force. The polar-fleeing force relates to the rotation of the earth. The second force that was suggested by Wegener—the tidal force—is due to the attraction of the moon and the sun that develops tides in oceanic waters. Wegener believed that these forces would become effective when applied over many million years. However, most scholars considered these forces to be totally inadequate.
Arthur Holmes in the 1930s discussed the possibility of convection currents operating in the mantle portion. These currents are generated due to radioactive elements causing thermal differences in the mantle portion. Hence option (b) is correct.
Explanation:
Wegener suggested that the movement responsible for the drifting of the continents was caused by pole-fleeing force and tidal force. The polar-fleeing force relates to the rotation of the earth. The second force that was suggested by Wegener—the tidal force—is due to the attraction of the moon and the sun that develops tides in oceanic waters. Wegener believed that these forces would become effective when applied over many million years. However, most scholars considered these forces to be totally inadequate.
Arthur Holmes in the 1930s discussed the possibility of convection currents operating in the mantle portion. These currents are generated due to radioactive elements causing thermal differences in the mantle portion. Hence option (b) is correct.
