Contour plowing, Pennsylvania, 1938. Contour bunding, Catalonia, 2007. Contour ploughing or contour farming or Contour bunding is the farming practice of plowing and/or planting across a slope following its elevation contour lines.
1 recurring middle ear infections.  Fluid in the ear may be accompanied by signs and symptoms of allergies or an upper respiratory infection including congestion, runny nose, post nasal drip, or watery eyes.
Head injury, strenuous physical activity, ear infections, and atmospheric pressure changes can cause inner ear fluid to leak into your middle ear. This can cause balance problems. Sea travel can cause balance problems that may take hours, days, or months to clear up. A tumor, such as an acoustic neuroma, can also cause balance problems.