Some Natural Phenomenon Test - 2

Refills A and B will repel each other. This is because both refills acquire similar charge when rubbed with polythene, and like charges repel each other.

Tectonic plate (also called lithospheric plate) is a massive, irregularly-shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometres across; the Pacific and Antarctic Plates are among the largest.
Epicentre - The point on the Earth's surface directly above the focus of an earthquake
Hypocentre - The point within the Earth where an earthquake rupture starts

Modified Mercalli (MM) Intensity Scale was developed in 1931 by the American seismologists Harry Wood and Frank Neumann.
This scale, composed of increasing levels of intensity that range from imperceptible shaking to catastrophic destruction, is designated by Roman numerals. It does not have a mathematical basis; instead it is an arbitrary ranking based on observed effects.

Both statements A and B are correct.
P waves are also known as compressional waves, because of the pushing and pulling they do. In a P wave, particles move in the same direction that the the wave is moving in, which is the direction that the energy is traveling in, and is sometimes called the 'direction of wave propagation.
S waves move rock particles up and down, or side-to-side--perpendicular to the direction that the wave is traveling in (the direction of wave propagation).
An S wave is slower than a P wave and can only move through solid rock, not through any liquid medium.

Earthquakes happen due to movements in the Earth's crust. The movements release enormous energy which spreads outwards.
Earthquakes occur when the two seismic plates overlap. The areas near equator are not necessarily more prone to earthquakes. Also, the movement of these plates is not dependent upon the atmospheric temperature.

Both statements A and B are true, and statement B is the correct explanation for statement A. Heavy building materials can cause massive damage.

During an earthquake, if you are outdoors, then find a clear spot, away from buildings, trees and overhead power lines; and drop to the ground.

A P wave, or compressional wave, is a seismic body wave that shakes the ground back and forth in the same direction and the opposite direction as the direction the wave is moving.