Because it was built on sand and some of it sunk, and changed due to erosion and weathering of the land
They are associated with low density.<span />
Answer:
flexible
Explanation:
A surface extension can be made from the cover of a box if the cover is designed so it’s unlikely to fall off if the mounting screws become loose. The surface extension wiring method must be flexible to permit the removal of the cover and provide access to the box interior, and equipment grounding continuity must be independent of the connection between the box and the cover.
