houses have roofs so rain, hail, or other things will not get in houses.
Yes. There were roofs on Mohen-Jodaro Houses.
The prepositional phrase is "roofs of houses."
All countries in Europe have sloping roofs on at least some of their houses
houses in hills have sloping roofs so that the rain-water and snow may drain off easily.
Short answer: No. Longer answer: Although lots of houses there have sloping roofs, Holland is not 'the' country. Lots of houses have flat roofs too. In countries with lots of snow each winter, houses tend to have more sloping roofs; almost all have in the alps (Austria, Switzerland).
Green roofs are mainly made of cannabis.
Wood houses with thatched roofs.
of houses
Tiles, slates and some very old houses in rural areas have thatched roofs made from reeds.
Green roofs are specially prepared for growing grass or other plants on them
mountains have slanting roofs so that the ice can slide of and if houses in mountains heve flat roofs the ice on the roof will eventually melt to water and there will be seipage in the house