Translations:Introduction - Chapter 1/11/en

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Seismic waves can be either longitudinal or transverse. Transverse mechanical waves require a rigid medium (such as rock) to transmit their energy. A fluid (either liquid or gas) lacks the required rigidity. Hence, airborne sound waves and waterborne ocean waves are longitudinal waves. In addition to mechanical waves, there are electromagnetic waves. Such waves can travel though a material medium, such as glass, but they also can travel though a vacuum, such as in outer space. Sunlight is the most familiar type of electromagnetic wave. All electromagnetic waves are transverse.