The total value of all goods and services produced by a country in a year:
a. gnp
b. gdp
c. gni
d. u. n. hdi

If you mean how the great lakes formed, then  the great lakes began to form at the end of the last glacial period 14,000 years  ago, ice sheets  retreated, which led to exposing the basins they had carved into land which then filled with melt-water.

Answeraccept the child without reservations;