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.
What did they eat? The Navajo were farmers, hunters and gatherers. They hunted on horseback. But they tended sheep and planted corn. The sheep were important. Sheep provided wool and food. Corn was even more important. In olden times, the Navajo held religious ceremonies to honor The Corn People, the supernatural beings who kept the corn safe. The Navajo also grew beans, squash, melons, pumpkins, and fruit. What did they wear? When the weather was cold, they wore clothing made from deerskin, sheepskin, and wool.