Field, laboratory, and library manual in physical geography . day and proceed in a similar mannerwith all data for the time of observation. How far in feet is mean lower low water below mean sealevel ? (See the note at the bottom of the page in the tide table.)Draw a line to represent mean sea level. By referring to thealmanac determine the dates of the moons phases during thetime of observations of the tides. On the horizontal line justabove the highest high tide make drawings to represent thesedifferent phases of the moon, being careful to get them in thespaces for the correct dates. Give yo
Field, laboratory, and library manual in physical geography . day and proceed in a similar mannerwith all data for the time of observation. How far in feet is mean lower low water below mean sealevel ? (See the note at the bottom of the page in the tide table.)Draw a line to represent mean sea level. By referring to thealmanac determine the dates of the moons phases during thetime of observations of the tides. On the horizontal line justabove the highest high tide make drawings to represent thesedifferent phases of the moon, being careful to get them in thespaces for the correct dates. Give your diagram a title. At what phase of the moon are the tides highest ? At whatphase are they lowest ? At what phase do the tides have great-est range ? What name is given to these tides ? At what phaseof the moon do the tides have least range ? What name is givento these tides? Make drawings to show the positions of theearth, the sun, and the moon at the time of greatest range oftides; at the time of least range of tides. What causes tides ?How do you know?. 141 142 PHYSICAL GEOGRAPHY MANUAL EXERCISE LVIOCEAN CURRENTS Observe the pilot chart of the North Atlantic ocean. How isthe direction of the ocean currents indicated ? (See the explana-tion near the lower left-hand corner of the map.) What is thedirection of the current at each of the following points : (1) south-west of the Cape Verde islands, 16 degrees north, 25 degrees west?(2) on the equator off the east coast of South America? (3) from10 to 20 degrees north latitude in the Pacific ocean? Comparethese directions with the directions of the prevailing winds atthese points, as given by the pilot charts. Compare the coursesof the ocean currents of the world with the directions of theprevailing winds, as shown by the maps, Fig. 29 and Fig. do the books give as the cause of ocean currents ? What is the direction of the current in the Caribbean sea?in the Atlantic ocean between Florida and the Bahamas ? Whatname is giv
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