Major players in the drama of 19th-century Texas were definitely the Comanches who at this time swept down from the cool highlands of the southern Rockies, and, mounted on horses, drove other tribes from West Texas.
What is SOUND? The periodic mechanical vibrations and waves in gases, liquids and solid elastic media. Specifically the sensation felt when the eardrum is acted upon by air vibrations within a limited frequency range, ie 20 Hz to 20 kHz. Sound of a frequency below 20 Hz is called infra. STRUCTURE-BORNE SOUND.
sound noun (NOISE). A2 [C or U] something that you can âhear or that can be âheard: They could âhear the sound of a âbell âtolling in the âdistance. She âstood âcompletely still, not making a sound. Suddenly we âheard a âloud âknocking sound from the âengine. Sound can âtravel over very âlarge âdistances in âwater.