Geology and Earth Structure

Japan experiences the most frequent earthquakes because it sits on multiple tectonic plate boundaries (Pacific, Philippine Sea, Eurasian, and North American plates). About 20% of the world's earthquakes of magnitude 6.0 or greater occur in Japan, making it the most seismically active country among the options.

The Richter scale, developed by Charles Richter in 1935, is the most well-known magnitude scale for measuring earthquake strength based on seismic wave amplitude. The Mercalli scale measures intensity (observed damage/effects), not magnitude. Kite and Avalanche scales are not relevant to seismology.

S -waves or secondary waves which only passes through the solid forms

Wegener proposed two main forces to explain continental drift: pole-fleeing force (centrifugal force due to Earth's rotation) and tidal force (gravitational pull of the moon and sun). While his theory was incomplete, these were the mechanisms he suggested. Gravitational force, solar energy, and wind energy are not the specific forces Wegener identified.

McKenzie, Parker, and Morgan were all key advocates and developers of the plate tectonics theory in the 1960s. McKenzie and Parker worked on plate kinematics, while Morgan proposed the concept of mantle plumes and hotspots. All three made fundamental contributions to establishing plate tectonics as the unifying theory of geology.

The lithosphere consists of the crust and the uppermost solid part of the mantle. It is the rigid outer layer of Earth that is broken into tectonic plates. Options A, B, and C are incorrect because the core is not part of the lithosphere, and 'upper core' is not a standard geological term.

divergent boundary, American plates are separated from the Eurasian and African plates

Among the options, the Indo-Australian plate (including New Zealand) is the major plate, though typically referred to as the Indo-Australian Plate. Philippine, Arabian, and Cocos plates are all minor or secondary plates. The seven major plates are: Eurasian, Pacific, Indo-Australian, African, North American, South American, and Antarctic.

In convergent boundaries, the subduction zone is where one tectonic plate descends beneath another into the mantle. This process creates deep ocean trenches, volcanic arcs, and earthquakes. 'Convergent zone' is too general, while 'deduction zone' and 'original site' are not geological terms.

The Himalayas were formed from the Tethys geosyncline, which was a vast sedimentary basin between the Indian and Eurasian plates. When these plates collided approximately 50 million years ago, the sediments in the Tethys Sea were folded and uplifted to create the magnificent Himalayan mountain range we see today.

Fault zones are the boundaries of the earth's plates where earthquakes tend to occur.

The earth's crust will not feel tremors upon being hit by lightning. Where ever lightning falls will burn or get damaged,  but it will not cause tremors or aftershocks.

 This statement is not about the mantle. It describes the outer core of the innermost part of the earth.

A tsunami is caused by earthquakes or volcanic activity occurring under the ocean.

A seismograph is the instrument that records seismic waves produced by earthquakes. A barograph records atmospheric pressure, a hydrograph records water level/flow, and demograph is not a standard instrument.