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- Frequently the cracks extend deeper than 1 m and are very wide. Vertisols are mostly found in regions with distinct wet-dry seasons. They are of minor extent25 KB (3,718 words) - 17:28, 13 February 2019
- America, and it probably has the richest temperate-subtropical fern flora in the world. Most of North America is temperate or arctic, and much of the western69 KB (10,503 words) - 23:43, 13 February 2019