drainage basins

Across

• 1. the type of precipitation that involves air masses rising over mountains, condensing then raining (10)
• 4. a physical factor affecting drainage basins that can result in a replenished groundwater store (4, 4)
• 5. a physical factor affecting drainage basins that is very susceptible to seasonal change (7)
• 6. when water flows off impermeable surfaces (6, 6)