Instrument for measuring blueness of the sky or ocean is called ________ A. Bathymeter B. Ceraunograph C. Cyanometer D. Barometer

The correct answer is: C. Cyanometer.

A cyanometer is an instrument used to measure the blueness of the sky or ocean. It is a type of spectrometer that measures the intensity of light at different wavelengths. The intensity of light at blue wavelengths is used to calculate the blueness of the sky or ocean.

A bathymeter is an instrument used to measure the depth of water. It

is typically used to measure the depth of oceans, lakes, and rivers.

A ceraunograph is an instrument used to measure the frequency of lightning strikes. It is typically used to measure the frequency of lightning strikes in a particular area.

A barometer is an instrument used to measure atmospheric pressure. It is typically used to measure the pressure of the atmosphere at a particular location.