एक समोच्च योजना (contour plan) में, जब कई समोच्च रेखाएं एक ही स्थान पर मिलती हैं या एक साथ दिखाई देती हैं, तो यह किसकी उपस्थिति को दर्शाता है?

Consider the following statements about the characteristics of contours: I. Closed contour lines with higher values inside show a depression/lake. II. A contour is an imaginary line joining points of equal elevation. III. Closely spaced contours indicate a steep slope. IV. Contour lines can cross each other in the case of an overhanging cliff. Which of these statements are correct?

Closed contour lines with higher elevation values inside represent a: