Q. Sources of oil contaminations are

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Q. Almost, 61% of oil incidents are caused by fires, explosions and

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Q. In water, precipitation raises noise about 30 dB, ranges between

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Q. In 1996, a Comprehensive Test Ban Treaty was signed by all countries, aiming at stoppng

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Q. Underground tests in United States started in

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Q. Military sonars, used in targeting

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Q. Drilling causes loud sounds, about

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Q. Soviet Union started underground nuclear weapon testing in

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Q. An underground nuclear testing, started by united kingdom in

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Q. Active sonar is involved in emitting pulses of sounds, as well as lightening for

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Q. Mid-frequency sonars has a frequency range of 1 to

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Q. High frequency sonar is immersed into mine localisation, seafloor mapping and

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Q. Low frequency sonars has a frequency up to

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Q. Dredging deliver sounds with an average intensity, ranges between

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Q. "SONAR" stands for

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Q. Mid frequency sonars are participated in submarine detection and

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Q. Cracking in ice, produces sound pulses, approximately

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Q. China and France, started an underground nuclear testing in

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Q. Higher sounds are mostly due to oscillations of bubbles in the

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Q. Wind blowing produces sounds in water, ranges between

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