Borehole Problems

An isocline is a line joining points with equal __
An isopycnal is a line of constant __
Contour lines (thinner lines) between index contours are called
Contour map is given below based on it answer the following questions with best possible answer

Scale: 1cm=100m
Given That: AD=1.80cm, AB=1.15m, BD=0.6cm, DC=0.5cm, CE=1m
What is the angle of dip (in degree) of Shale bed?
Which of the following is true regarding the shape of contour lines
Closed contours indicate a ____ or a ____