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 Navajo Indian tribe is closely related to the Apache tribes. The Navajo Indian tribes are currently located in Arizona, New Mexico, Utah, and Colorado. Most of the tribes are still currently living in their traditional territory today. Today the capital of the Navajo Nation is located at Window Rock in Arizona.he Navajo Indians are the largest federally recognized Native American Indian tribe in the United States. Their reservation is spread out through out the four corners of Arizona, New Mexico, Utah and Colorado.