The difference between petroglyphs and cuneiform is:
petroglyphs are pictures carved in stone and cuneiform is writing on clay tablets.
petroglyphs are symbols in caves and cuneiform are symbols on papyrus.
petroglyphs are found in a small area of egypt and cuneiform is found all over the world.
petroglyphs are an early form of writing and cuneiform is a later form of writing.

Petro glyphs are the rock carvings made on a stone to shape an image on it. It was worldwide rock art and many inscription and depiction of images are made on a stone. Petro in Greek means stone and glyph means image.

Cuenus means wedge in Latin. It is a form of writing on soft clay with the help of a stylus. Wedge shaped characters are marked on a clay and this type of writing began in Mesopotamia.

After writing on the soft clay, it is heated on a huge oven so that the characters are preserved as a record for a long time.  

native americans suffered high rates of poverty and unemployment.

during the late 1960s and early 1970sthe need for political militancy grew among the native americans. throughout the 1960s, they had been the nation's poorest minority group, the most deprived group, according to practically every socioeconomic measure. in 1970, the indian unemployment rate was 10 times the national average, and 40 percent of the native american people were below the poverty line.