A smooth flat discontinuity whose major plane is not perpendicular to the direction ofsound propagation may be indicated by:

An echo amplitude larger in magnitude than the back surface reflection

An echo amplitude comparable in magnitude to the back surface reflection

A complete loss of back surface reflection

A smooth flat discontinuity whose major plane is not perpendicular to

1.	A smooth flat discontinuity whose major plane is not perpendicular to the direction ofsound propagation may be indicated by:
A.	An echo amplitude comparable in magnitude to the back surface reflection
B.	A complete loss of back surface reflection
C.	An echo amplitude larger in magnitude than the back surface reflection
D.	All of the above
Answer» C. An echo amplitude larger in magnitude than the back surface reflection