# CONTOUR LINES - PowerPoint PPT Presentation

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CONTOUR LINES. Source: CAPS Oxford Successful Social Sciences Learner’s book Gr. 9 p. 10. CONTOURS ARE LINES ON A MAP THAT JOIN PLACES OF THE SAME HEIGHT ABOVE SEA LEVEL. COUNTOURS MAKE PATTERNS SHOWING THE RELIEF OR SHAPE OF LAND. FACTS ABOUT CONTOURS:. Contour lines never cross one another.

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CONTOUR LINES

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## CONTOUR LINES

Source: CAPS Oxford Successful Social Sciences Learner’s book Gr. 9 p. 10

CONTOURS ARE LINES ON A MAP THAT JOIN PLACES OF THE SAME HEIGHT ABOVE SEA LEVEL. COUNTOURS MAKE PATTERNS SHOWING THE RELIEF OR SHAPE OF LAND.

• Contour lines never cross one another.

• Contour lines can join to form a single contour line only where there is a vertical cliff

• Contour lines never split.

• When contour lines are far apart the slope is gentle.

• When contour lines are close together the slope is steep.

• When contours are evenly space the slope is uniform.

• The difference in altitude between successive contours is know as the contour interval or the vertical interval.

• Source: CAPS Spot On Social Sciences

Learner’s Book Gr. 9 p. 2

### STEEP AND GENTLE SLOPES:

Contours on maps shows many different

landscape features. These are illustrated by

the way contours are arranged and spaced:

• Contours that are close together indicate a steep slope and contours that are far apart indicate a gentle slope.

• When contours are close at the top of the hill and gentle at the bottom, this indicates a concave slope.

• When the contours are gentle at the top of the hill and close together at the bottom, this indicates a convex slope.

• Source: CAPS Spot On Social Sciences

Learner’s Book Gr. 9 p. 3

### How height/altitude can be indicated on a map:

• Contour lines are brown lines on a map joining points at the same height above sea level.

Source: National Curriculum FOCUS on Map Skills Grades 10 – 12 p. 38

• Spot heights are precise points whose altitudes are shown on maps

• Bench marks are fixed points or a specific height above sea level that are marked on the ground.

Source: National Curriculum FOCUS on Map Skills Grades 10 – 12 p. 38

• Trigonometrical stations are survey points whose location and altitude have been precisely recorded

The Beacon number is: TTP 303

The altitude (in meters) is: 1257m

Source: National Curriculum FOCUS on Map Skills Grades 10 – 12 p. 38