Contours
Solutions for Geography, Class 10, ICSE
Describe The Following Terms
4 questionsAnswer:
Contour interval means the difference of height between two consecutive contours. For example, if one thick contour shows the height 300 metres and the next thin contour depicts the height of 320 metres. Then, the contour interval is 20 metres.
Explain How Would You Distinguish Between The Following On The Basis Of Contours
4 questionsAnswer:
| Gentle Slope | Steep Slope |
|---|---|
| In gentle slopes, the change of elevation is gradual. Normally about 1:25 gradient of elevation is gradual. | Steep slope suddenly slopes up or down. |
| The contours are placed wide apart in gentle slope. | For steep slopes, the contours are drawn close to one another. |
Answer:
| Scarp | Dip |
|---|---|
| A scarp has a narrow top with a steep slope. | A dip has a narrow top with a gentle slope. |
| The contour lines are closer to each other. | The contour lines are spread far apart. |
| It has a gradient of 1:3. | It has a gradient of about 1:12. |
Answer:
| Ridge | Water Divide |
|---|---|
| It is a long and narrow highland sloping steeply downwards on its sides. | A line which separates two adjacent drainage basins is known as water divide. |
| Contours showing a ridge are elongated and are closely spaced. | The side on which the ridge is steeper, the contours are drawn closely together, whereas the side on which the ridge is gentle, the contours are drawn far apart. |
Answer:
| Peak | Depression |
|---|---|
| The highest point of a mountain is known as a mountain peak. | A depression is formed when there is a sudden decrease in height at the top of a conical hill. |
| Contours showing a conical mountain are almost circular with peak of the mountain as their centre. The contours are drawn almost at regular distances, the value of which increases towards the centre, which is the peak and represented with a dot. | Contours showing a depression are almost circular like a conical hill with a depression as their centre. The contour lines are drawn at regular distances, and their value keeps on increasing towards the centre, where the lines suddenly show decrease in height at the centre, which is the depression. |
Give The Terms Used In Contours For Each Of The Following
5 questionsProject Activity
1 question
Short Answer Questions
10 questionsAnswer:
Hill shading and hachuring only give an impression of the slope but do not indicate the heights of the land above sea level, whereas the contours show both impression of the slope as well as the heights of the land above the sea level.
Answer:
The contour lines are shown by brown colour as thick brown lines and thin brown lines. Contour lines show:
1. Elevation of land: The height of a contour is indicated by figures inserted in a break in the line.
2. Steepness of its slope: When the contours are very close, they represent steep slopes. When they are farther apart, they represent gradually increasing slopes. Absence of contour lines indicate that the land is flat i.e., a low land.
3. Shape of land at various heights: The contour lines indicate the shape of land. For example, almost circular contours whose value decreases inside represent a lake.
Answer:
| Bench Mark | Spot Height |
|---|---|
| These are marks etched on stone or a building to indicate the accurate height determined by surveys. | It refers to the height of a point on the ground above the mean sea level. |
| It is written as "BM" followed by a number. | It is represented by a dot followed by a number on the map. |
Answer:
Rivers and streams are shown on the map with blue colour. Generally water flows from higher altitude to lower altitude. Since the contours indicate the elevation of land, we can use them to find the direction of a river or stream.
The rivers and streams usually flow from contours representing greater elevations to contours representing lower elevations. The course of a well-developed river can be divided into three stages - upper, middle and lower course; each of which can be recognised with the help of contour lines.
