Earth science answer all of the following questions. 10: what are the most important density currents in the world ocean? 11: why does the mediterranean sea become so salty that it forms its own density current into the atlantic ocean? 12: how does a particle of water in a deep-water wave move in comparison to the wave itself? 13: don't do this one. 14: you are sitting on a beach watching waves move toward shore under a wooden dock. you note that the time between the first and sixth wave crests (five wavelengths) to pass a dock post is one minute. what is the period of one of these waves stated in seconds. 15: what condition within the ocean allows the formation of internal waves? 16: why do wave crests bend to become more nearly parallel to the shore as the wave approaches land? 17: which kind of beach would likely be wider- a fine sand beach or a gravel beach? why? (hint: sketch the slope of each kind of beach and add the high- and low-water marks for the same heights of high and low tides.)