Geography Answer in brief

(i) It is helpful selecting the type of farming to be practiced plantation farming in hilly regions, intensive farming in low lying region.
(ii) In order to reduce the erosion of soil, trenches are dug out in the direction perpendicular to the slope of the land.
(iii) Trees are planted along such trenches. When the farmer digs out such trenches, he will be careful in maintaining the level.

(i) Contour lines are isolines of height.
(ii) These are drawn by joining the places of equal altitude.
(iii) These help in identification of land forms and their altitude from sea level.
(iv) These lines also help us to understand the nature and direction of the slope.

(i) Contour maps are useful to mountaineers, trekkers, soldiers, defence officers.
(ii) The nature of the ground and its shape can be estimated .
(iii) Defence officers use contour maps for strategic planning.
(iv) It is possible to identify suitable site for any project from the contour map of the region.

(i) While studying different landforms on the surface of the earth, one has to consider various facets of landforms like altitude, relief, slope, direction of slope and the drainage.
(ii) For this maps prepared using mathematical survey methods are used.
(iii) These maps help us to understand the above characteristics of the landforms.

(i) Contour lines join places with the same altitude on a map.
(ii) Therefore they generally do not cross each other.

(i) Contour maps help us to understand various facets of landforms, like altitude, relief, slope, direction of slope and the drainage.
(ii) These maps are of immense use to mountaineers, trekkers, soldiers, defence officers, etc.
(iii) These maps prove to be of great use in planning of a region.