a horizonaarocline instabilityaasterly waveabaabackabc soilaberrationabiotic erosionablationabney levelabnormalabnormal magnetic variationabnormal pressureabnormal stageabnormaly high pressureabrasionabrasion testabrupt channel expansionabrupt riseabrupt waveabsoloute wave velocityabsolut stablityabsolut stablity regionabsolute altimeterabsolute altitudeabsolute concentratioinabsolute droughtabsolute humidityabsolute instrumentabsolute isohypseabsolute maximum tempratureabsolute minimum tempratureabsolute specific gravityabsolute stabilityabsolute velocityabsolute vorticityabsolute zeroabsorbed waterabsorbing mediumabsorbing wellabsorptionabsorption bandabsorption coefficientabsorption cross sectionabsorption hygrometerabsorption lineabsorption potentialabsorption spectrumabsortion bankabsortion terrace