What are the meanings of the terms topographic map, contour line, contour interval and index contour?

Topographic map:  They show the forms and features of land surfaces

Contour line: a line on a map connecting the points on a land surface that have the same elevation.

Countour interval:  the vertical distance between the elevations represented by adjacent contour lines on a map.

Index contour: Index contours are bold or thicker lines that appear at every fifth contour line.

Explanation:

d) center of the mid-ocean ridge

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nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides