[word=□]
[word=rises]
At other times , the curve starts out flat , then rises sharply at some level of exposure , suggesting the existence of a " threshold , " as in Line B. Whether there are thresholds below which no effects occur is a major issue . The Medicine Lake shield rises about 1200 meters above the Modoc Plateau to an elevation of 2,376 meters . Measurements of water table recovery at the end of a pumping test ( rate at which the water table rises after pumping stops ) can be beneficial in evaluating performance of irrigation wells . Accustomed to see his whole fortune trembling in the scales of chance , and dexterous at adopting expedients for casting the balance in his favour , his health and spirits and activity seemed ever to increase with the animating hazards on which he staked his wealth ; and he resembled a sailor , accustomed to brave the billows and the foe , whose confidence rises on the eve of tempest or of battle . Typical A-weighted spectra of tires running on the smooth and textured concrete showed highest amplitudes around 1,000 Hz with fairly gradual rises and falls .