The workers can be
protected by "trench box". Trench shields which are known as
Trench Boxes or Trench Sheets as well, are steel or aluminum structures
utilized for securing utility laborers while playing out their obligations
inside a trench. They are generally developed with sidewalls of changing
thicknesses held separated by steel or aluminum spreaders.
Low Moral Character could be one factor
Rainfall is irregular and much of this biome has been turned into farmlands is describing the biome: grasslands.
Answer: C It shows the meaning of the symbols used on the map
Explanation:The key of a map is usually used for if the map is complicated like with symbols like triangles that usually represent mountains.