The correct answer is - A) Permafrost used to be permanent.
The permafrost used to be permanent until recently, so using certain techniques of building on it functioned properly. But with the climate changes that are becoming more and more evident, the permafrost is no longer permanent, but instead, it is either defrosting in some part of year and then forming again, or has been totally absent from some regions in the present.
That has caused changes in the rules governing building on permafrost. The reason for the changes is that the old techniques do not work properly anymore, and the permafrost changes are making change in the landscape, making big damages on the infrastructure in meantime.
Natural, it is not man made.
Sanctuary city<span> is a name given to a city in the United States that follows certain procedures that shelters illegal immigrants.
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1L is 1000ml so 3L of soup will be 3000ml
In southern india it is very humid is the tropical wet climate
