1. Why are the levels of all the seas equal in the
world?
2. How is the sea level measured?
3. What are the uses of maps showing height?
4. What differences do you find between the life
style of people living on high altitudes and low
altitudes?
5. How are maps helpful to people?
6. Read the para 'Contour Lines' on page 5 and
Answers
Answer:
● Because the ocean is one continuous body of water, its surface tends to seek the same level throughout the world. However, winds, currents, river discharges, and variations in gravity and temperature prevent the sea surface from being truly level.
● Sea level is primarily measured using tide stations and satellite laser altimeters. Tide stations around the globe tell us what is happening at a local level—the height of the water as measured along the coast relative to a specific point on land.
● It shows the surface elevation. It shows the display in 3 D computer graphic. They are widely used to understand the nature of terrain. Gives the actual displacement and location of mountains and valleys.
● As altitude rises, air pressure drops. In other words, if the indicated altitude is high, the air pressure is low. ... This is what meteorologists and mountaineers mean by "thin air." Thin air exerts less pressure than air at a lower altitude. High-altitude locations are usually much colder than areas closer to sea level.
● Maps represent the real world on a much smaller scale. They help you travel from one location to another. They help you organize information. They help you figure out where you are and how to get where you want to go.
● In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.......