Ecology: Lakes Pyramid Lake, Nevada, is described as the pride of the Paiute Indian Nation. It is a beautiful desert lake famous for very large trout. The elevation of the lake surface (feet above sea level) varies according to the annual fl ow of the Truckee River from Lake Tahoe. The U.S. Geological Survey provided the following data:

Make a time-series graph displaying the data. For more information, visit the Brase/Brase statistics site at http://www.cengagebrain.com and fi nd the link to the Pyramid Lake Fisheries.

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Year Elevation Year Elevation Year Elevation 1986 3817 1992 3798 1998 3811 1987 3815 1993 3797 1999 3816 1988 3810 1994 3795 2000 3817 1989 3812 1995 3797 1990 3808 1996 3802 1991 3803 1997 3807