. Describe how contour values on a topographic map of land surfaces differ from

Question

. Describe how contour values on a topographic map of land surfaces differ from contour values on a bathymetric map. How are contour values determined for each type of map?

. How do sediments relate to both active and passive margins? Why are there no deep trenches on passive margins?

Are abyssal plains perfectly flat? Why or why not?

What evidence do scientists have that spreading rates are considerably faster in the Pacific than in the Atlantic Ocean basin?

If a magnetic anomaly 3.3 million years old has travelled 46.5 kilometers from the ridge crest, is it considered to be a slow, fast, or intermediate spreading ridge? Explain your answer?

Explanation / Answer

first of all, let me introduce you to the concept of contour lines. Actually, the single contour line is a locus of all the points which enjoy the similar value. Now this similar value may be of an elevation or of depth, for example, if I said contour of 15 m elevation it means, that on each point on this contour the elevation of each and every point is 15 m

Now comes to question

In case of Topography map, the contour represents the elevation of points with respect to sea level.

In the case of the bathymetry map, the contour represents the depth of points with respect to sea level.

In case of active margin the sediments formed at accretionary wedge , they formed because of friction of subducting plate to overriding plate. The sediments are angular and poorly sorted. some time show breccia like complex. In case of passive margin the sediments are deposited by the river deltas, they are well sorted .

No, abyssal plans are not perfectly flat, there is seamounts, Mid-oceanic ridges, and trenches that deviate its topography from getting to perfectly smooth.

Magnetic strips are one of the evidence and satellite data.

half rate of spreading = distance travel/ time taken=46.5*10^6 cm /3.3*10^6 year= 14 cm/yr

it is very fast, so far Nazca which is the fastest plate has a speed 10cm/yr

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