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.
For to the average Navajo there is a curse attached to the making of a sand-painting blanket. Navajo Sandpaintings, also called dry paintings, are called places where the gods come and go in the Navajo language. They are used in curing ceremonies in which the gods' help is requested for harvests and healing.The figures in sand paintings are symbolic representations of a story in Navajo mythology.They depict objects like the sacred mountains where the gods live, or legendary visions, or they illustrate dances or chants performed in rituals.he figures in sand paintings are symbolic representations of a story in Navajo mythology. They depict objects like the sacred mountains where the gods live, or legendary visions, or they illustrate dances or chants performed in rituals.