Waves of sound have different properties, among them amplitude is the one that determines the loudness or volume of the sound. The amplitude is the height of the wave, measured in meters, or in other word the maximum displacement of the sound's particle from its position of equilibrium. If a dolphin calling sounds louder because of the background noise, the waves of the sound that the dolphin produces would have a higher amplitude.

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Lesson 3 : wrapping up Unit 3

musickatia [10]

Answer:

9 The water levels are constant in estuaries

Explanation:

10. Black sands are found when tides are particularly higher.
11. Both tides and currents are predictable movements of water.
12. The salinity of brackish water can vary with the tides.
13. The barnacles attach themselves to seaweed and feed on it.
14. Ocean helps to lessen global warming by absorbing lots of carbon dioxide.
15. Five Solomon islands have disappeared because of erosion and increasing seas.
16. Bottom-feeding fish are not part of the benthic community.

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