a group of persons, as employees, charged with carrying out the work of an establishment or executing some undertaking. a group of assistants to a manager, superintendent, or executive. a member of a staff.
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. They are the energy that travels through the earth and is recorded on seismographs. Types of Seismic Waves. There are several different kinds of seismic waves, and they all move in different ways.
Types of Seismic Waves (pages 52â53) Key Concept: Seismic waves carry energy from an. earthquake away from the focus, through Earthâs. interior, and across the surface. â¢ An earthquake is the shaking that results when rocks. move inside Earth. An earthquake is caused by stress. along a fault.