In addition, the contour lines decrease topsoil movement and avoid soil erosion. Land degradation, landslides, soil erosion, desertification are the major threats to the environment because of the expansion of agriculture and construction activities.
Fertile land is exploited more and leads to the barrenness if not utilised judicialy. How can we conserve land resources? Ans: Decline in the productive capacity of land for some time or permanently is known as land degradation. Soil degradation is the physical, chemical and biological decline in soil quality. It can be the loss of organic matter, decline in soil fertility, and structural condition, erosion, adverse changes in salinity, acidity or alkalinity, and the effects of toxic chemicals, pollutants or excessive flooding.
The type of soil degradation refers to the nature of the degradation process displacement of soil material by water and wind; in-situ deterioration by physical, chemical and biological processes. Contour lines never cross on a topographic map because each line represents the same elevation level of the land. Topo lines rarely ever touch or cross That is because each line is a different elevation.
That means no point can be two different elevations. Answer Expert Verified A contour line consists of points that are all at the same elevation, and each line has a different elevation. If two lines crossed, the point where they cross would be a point on both lines, so it would be a point that has two different elevations. While contour lines describe edges, cross-contours describe form and volume. Yes its true the closer the contour the stepper the slope is closed circle contour indicate the top of a mountain or a hill.
Because contour lines represent elevation and you can't have two different elevations at the same point. Explanation: Golden rules include, for example, that each point on a contour line has the same elevation, that contour lines separate uphill from downhill, that contour lines do not touch or cross each other, except in A cliff, among others. True The Golde Rules of Contour Lines are the following: contour lines never cross contour lines have the same elevation contour lines spacing depends on the characteristics of the slope contour lines crossing a stream or a valley are v-shaped the tops of hills, mountains and depressions are marked by closed circles.
A contour line consists of points that are all at the same elevation, and each line has a different elevation. Leave a Reply Cancel reply Your email address will not be published. So no, they never cross. Parallel lines. Each contour line represents a certain elevation, and the difference in elevation between any two adjacent countour lines is constant.
So, for example, if in the map area there were a cone-shaped feature, like a volcano, the shape would be shown as a circle in a circle in a circle in a circle and so on.
The more contour lines you cross along a path, the steeper the climb, and the fewer contour lines you cross on the path, the more level it is. Log in. Earth Sciences. Study now. See Answer. Best Answer. Each contour line represents a different elevation. If two contour lines crossed, or touched, then the point where they cross or touch would be a point that has two different elevations, which would be pretty silly. Study guides. Lakes and Rivers 20 cards.
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Why is it unlikely that two contour lines will cross? Describe why contour lines never cross?
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