What determines the direction a river flows in the US?

Unless the land it totally flat, rivers of water run downhill. If the source of a river is at a higher elevation than the mouth, that river will run from the source to the mouth. However, if that (higher) source is to the south of the mouth, that river will then flow to the north (downhill).

How close the contour lines are is an indication of an area’s What?

The arrangement of the contour lines on a map gives a direct indication of the changes in the field’s topography (Fig. 55). In hilly areas, the contour lines are close together while they are wider apart on flat slopes. The closer the contour lines, the steeper the slope.

Why will the contour lines be in irregular shape?

The slope between contour lines is assumed to be uniform. The distance between contours indicates the steepness of the slope. Irregular contours signify rough, rugged country. Contour elevations are shown on the uphill side of lines or in breaks to avoid confusion.

What do V shaped contour lines pointing uphill indicate?

The “V” shape contours indicate streams and drainage. As you can see, the “V” points uphill to a higher elevation. Generally, you can connect the apexes of the upward-pointing, “V” shaped contour lines to delineate a stream.

What shape are the contour lines that indicate a depression?

On a contour map, a circle with inward hatches indicates a depression. 4. V-shaped expanses of contour lines indicate stream valleys. Where a stream crosses the land, the Vs in the contour lines point uphill.

What are depression lines called?

Contour lines that show a depression, crater, or sinkhole on a map are represented by dashed lines (hachure marks) on the inside of a contour line. The elevation of the first depression contour is the same as the nearest regular contour line.

What is causing the V shape in the topographic layers?

What is causing the “V” shape in the topographic layers? Contour lines bend upstream and form a “V” when crossing a stream, river, or creek. On every topographic map, there lines of equal elevation, called contour lines 6.

What is outcrop pattern?

Geologic maps show where various rock units and structures lie at the earth’s surface. Because many of these structures are planar, or approximately planar features, they interact with topography in predictable ways. Flat-lying Beds.

How do you identify an outcrop?

In order to determine the outcrop pattern, these structure contours must have a contour interval equal to (or a multiple on the contour interval on the topographic map. They also must represent the saine elevations.

What is the meaning of outcrop?

1 : to project from the surrounding soil ledges outcropping from the eroded slope. 2 : to come to the surface : appear.

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