How modern system of timekeeping (year-month-day) is related to observable phenomena of the sky?

Modern austria followed switzerland's economic model by a. exploiting its natural resources b. developing skilled-labor industries c. engaging in strip mining d. relying on a tourism industry

Many indigenous cultures use specific repeated motifs and patterns in their artwork. these repeated motifs the viewer to: select one: a. understand the meaning of the motif b. recognize the culture in which the artwork was made c. see similar motifs in the modern world d. understand artwork in the modern world

Which of these is a way that mining benefits society a: generating acid rain b: providing industrial materials c: producing acid mine drainage d: creating heavy metal pollution