1 For subsidence caused by sudden collapse of the ground to form sinkholes, several measures can be taken. 2  First, geologists can make maps of areas known to be underlain by rocks like limestone, gypsum, or salt, that are susceptible to dissolution by fluids.
The Navajos used bows and arrows, spears, clubs, tomahawks, knives and sticks among their tools and weapons. Beyond these, they also used bolas and... The Navajos used bows and arrows, spears, clubs, tomahawks, knives and sticks among their tools and weapons. Beyond these, they also used bolas and blowguns. The Navajos employed the use of several tools and weapons:Bows and arrows were used by Native Americans to defend themselves, and sometimes for fishing. They also used them for hunting animals like bison.When fighting against European explorers, Native Americans used spears.
Many Navajo, or Dine', still live in the traditional hogan. It is a 6 or 8 sided building made by stacking logs similarly to a log cabin.When finished it appears to be round. The roof is made of smaller diameter wood that is covered with brush to fill the holes and earth over.The smoke hole is centered on the roof. Answer   The Navajo lived in the Four Corners Region which is consisted by the lands of northern Arizona, southern Utah and northern New Mexico in a 16 million acre â¦ s [65.000 sq Km] area.