While planning a cross country gliding flight, what ground structure should be avoided enroute?

Question

Question Quiz SPL - Sailplane Pilot License - Flight Performance and Planning

QuizVDS · Accepted Answer

Moist ground, water areas, marsh areas

QuizVDS · Answer

Stone quarries and large sand areas

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Highways, railroad tracks and channels.

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Areas with buildings, concrete and asphalt.

Id 236 - SPL - While planning a cross country gliding flight, what ground structure should be avoided enroute?