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.
The hogan is a sacred home for the Dine (DinÃ©) navajo people who practice traditional. Religion every family even if they live most of the time in a newer -- home must have the traditional hogan for, ceremonies and to keep themselves in. balancehe doorway of each hogan opened to the east so they could get the morning sun as well as good blessings. Today, many Navajo families still live in hogans, although trailers or more modern houses are tending to replace them. The older form of hogan is round and cone-shaped.