Describe how ozone over antarctica changed during the period from 1975 to 1985

Ozone over Antarctica changed during the period from 1975 to 1985 by decreasing by approximately 50 percent resulting in the creation of a hole in the ozone layer.

These findings were published in a 1985 publication by British scientists that studied the amount of ozone over Antarctica.  

wood carving remains today the primary sculptural art form of the sub saharan continent. african art history shows the earliest wooden sculptures from the 17th c are attributed to the kuba, central zaire but the earliest surviving sub-saharan sculpture is a zoomorphic head found in 1928 in central angola.

i hope this .

answer; i believe its (jade); good luck