Which of the following is evidence of the past existence of glaciers?

a. rift valleys

b. fjords

c. estuaries

d. oceanic ridges

B. fjords ,Glaciers carve fjords in valleys where they travel. A fjord is a long, narrow
valley with steep sides carved by glacial movement. A fjord represents the seaward end of a deeply excavated glacial-trough valley that was partially submerged by drowning after melting of the ice

2. x2 + 8x + 12 = 0 to prove: x = -6 or x = -2