Green Roof

An online crossword puzzle with 7 words. Play it free at AgileCrosswords.com.

Clues

the practice of growing plants exclusively in containers instead of planting them in the ground
unaffected or to prevent penetration by water
materials or devices to inhibit or prevent the water or of electricity
massive structures built in the ancient Mesopotamian
the natural or artificial removal of surface and sub-surface water from an area
a metropolitan area which is significantly warmer than its surrounding rural areas
a horizontal flat area of ground