A covering of concrete placed on the exposed top of an external wall is known as

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The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. 

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The earliest known audio tape recorder was a non-magnetic, non-electric version invented by Alexander Graham Bell's Volta Laboratory and patented in 1886.

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Mass media refers to a diverse array of media technologies that reach a large audience via mass communication. 

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Light rays from the sun appear to the naked eye as white light, but each ray contains a broad range of wavelengths

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Because the Earth rotates on its axis, circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect.