Field, laboratory, and library manual in physical geography . careful observations, and, if necessary, seekinformation from residents of the vicinity. Is the water level constant throughout the year? Do younote any changes of the average water level from year to year?If so, do you find evidence that it is higher than formerly?What evidence? Do you find evidence that it is lower thanformerly ? If so, what evidence ? Account for any changethat may have occurred in the water level. Do you find evi-dence that the lake is being filled with sediment? If so, whatevidence? Is the outlet a vigorous str
Field, laboratory, and library manual in physical geography . careful observations, and, if necessary, seekinformation from residents of the vicinity. Is the water level constant throughout the year? Do younote any changes of the average water level from year to year?If so, do you find evidence that it is higher than formerly?What evidence? Do you find evidence that it is lower thanformerly ? If so, what evidence ? Account for any changethat may have occurred in the water level. Do you find evi-dence that the lake is being filled with sediment? If so, whatevidence? Is the outlet a vigorous stream? Are its tributariesor its outlet the greater menace to the life of the lake? Ofwhat value to man is this lake ? 132 PHYSICAL GEOGRAPHY MANUAL Pakt II Refer to a map of North America and compare the number oflakes in Canada east of the parallel of 100 degrees west longi-tude with the number of lakes in the southern part of the UnitedStates. Refer to a map of the United States and compare thenumber of lakes east of the Missouri and Mississippi rivers and. Fig. 22. Bear Lake, at an Elevation of 6700 Feet, in San BernardinoMountains of Southern California The banks are so steep that the zones of vegetation are not marked north of the parallel of 40 degrees north latitude with the num-ber of lakes south of this region. How is the great number inone region accounted for? Lakes have been called the settling basins of the livers. Whatis there in this name which is appropriate? Considering thisalone, which would you think would have clearer waters, theSt. Lawrence river or the Missouri? How does this agree withwhat you know of the clearness of the water of the two rivers ? Of what value to commerce are the Great Lakes ? LAKES 13; to theWhichformertoward Pakt III Examine Fig. 21. Locate the sedges with referencelake. Compare the positions of sedges and shrubs,occupy drier ground, the shrubs or the pine trees ? Theoutlet of the lake can be seen in the background, leadingthe right. Wh
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