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| Description: - Upper-air pressure gradients are best determined through the heights of constant pressure due to density considerations. - Height contours indicate the pressure gradient. - Constant pressure surfaces of cooler air will be lower in altitude than those of warmer air. Picture Stats: Views: 349 Filesize: 63.21kB Height: 363 Width: 782 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=30773 |