Text: Wadi Natrun was one of the most important areas of Egypt in ancient times, primarily because it was the main source of the mineral natron used in the mummification and glassmaking processes.
Entailment: The resources used in the glassmaking and mummification processes were often extracted from Wadi Natrun.
Contradiction: Wadi Natrun was one of the least important areas of Egypt, primarily because it was barren.