The earth's part responsible for causing earthquakes is _________.
A. Crust of the earth
B. Mantle of the earth
C. Inner core of the earth
D. Outer core of the earth

Hint: Generally due to the movement of tectonic plates beneath the surface of the earth, earthquakes occur. The Tectonic Earthquake, Volcanic Earthquake, Collapse Earthquake, and Explosive Earthquake are four kinds of earthquakes.

Complete answer: The tremors are caused by the movement deep down within the uppermost layer of the earth, called the crust. The earth's crust consists of various parts of the landmass. They cause changes to the earth's surface. The plate of the planet responsible for causing earthquakes is the earth's crust. Along the edge of the oceanic and continental plates, most earthquakes occur. The crust of the earth (the planet's outer layer) is made up of several parts, called plates. Oceanic plates are called the plates under the oceans and continental plates are the rest. Because of the motion of a deeper part of the earth (the mantle) that lies underneath the crust, the plates shift about. These plates bump into each other at all times, pulling away from each other or past each other. Generally, the plates shift at about the same pace as your fingernails expand. Generally, earthquakes happen where two plates run into each other or slip past each other.
Hence, choice A- Crust of the earth is the correct one.

Note: Precaution should be taken during an earthquake. For accidents, check yourself and others. Check for damage to water, electricity, and electrical lines. Switch your radio on. Keep out of buildings that are destroyed. Look out for broken glass and debris. Remain away from the beaches. Keep away from areas that are affected. Be vigilant of chimneys (they might fall on you).