Relief - a form which is the earth's surface.Over time it is altered by the action of various forces.The places where once there were great mountains become plains, and in some areas there are volcanoes.Scientists seek to explain why this is so.And much has been known to modern science.
reasons transformations
terrain of land - one of the most interesting mysteries of nature, and even history.Because of the variation of the surface of our planet, and it changed the life of mankind.Changes occur under the influence of internal and external forces.
Of all the forms of relief are allocated large and small.The largest of them - a continent.It is believed that hundreds of centuries ago, when man did not exist, our planet had a completely different look.Perhaps there was only one continent, which eventually shattered into several pieces.Then they were divided again.And there were all those continents that exist today.
Another major form of steel oceanic trenches.It is believed that before were also less than the ocean, but then they became more.Some scientists argue that hundreds of years later there will be new.Others say that the water will flood some areas of land.
is changing terrain of the planet for many centuries.Even though that man sometimes very harmful nature of his activities are not able to significantly change the terrain.It needs such a powerful force that has only natural.However, people can not only dramatically transform the terrain of the planet, but also to stop the changes that are produced by nature itself.Despite the fact that science has made a big step forward as it is impossible to protect all people from earthquakes, volcanic eruptions, and more.
Basic Information
terrain of land and basic landforms attracted attention of many scientists.Among the main varieties - mountains, highlands and plains shelves.
Shelf - these are the areas of the earth surface, which are hidden under a layer of water.Very often, they stretch along the coast.Shelf - this is the kind of relief that occurs only under water.
Highlands - a stand alone mountain, the mountain valleys, and even the system of ridges.Much of what is called the mountains, is actually a plateau.For example, the Pamir - is not a mountain, as many believe.Also Tien Shan is a plateau.
Mountains - this is the most ambitious forms of relief of the planet.They tower over the land for more than 600 meters.Their tops are hidden behind the clouds.It so happens that in warm countries can see the mountain peaks are covered with snow.The slopes are usually very steep, but some brave souls dare to climb on them.The mountains can form a chain.
Plains - is stability.The inhabitants of the plains are least likely to suffer the relief changes.They almost did not know what an earthquake, because such places are considered most favorable for life.This plain - is the maximum surface of the earth is flat.
Internal and external forces
Influence of internal and external forces to the relief of the Earth's great.If you examine how to change the surface of the planet for centuries, we can see how what seemed like forever, disappears.It is replaced by something new.External forces are not able to change the topography of the earth as much as inside.And first and second classified into several types.
Internal forces The internal forces that change the topography of the Earth, can not be stopped.But in the modern world, scientists from different countries trying to predict when and where an earthquake, a volcanic eruption which will happen.
The internal forces include earthquakes, crustal movements and volcanism.
As a result, all of these processes lead to the emergence of new mountains and mountain ranges on land and on the ocean floor.In addition, there are geysers, hot springs, a chain of volcanoes, cliffs, cracks, crevices, landslides, volcanic cones and more.
external forces External forces are not able to produce a noticeable transformation.However, we should not lose sight of them.The external processes of forming the relief of the Earth, are the following: the work of the wind and flowing water, erosion, melting glaciers and, of course, the work of men.Although man, as stated above, has not yet been able to dramatically change the face of the planet.
work of external forces leads to the creation of hills and ravines, depressions, dunes and dunes, river valleys, gravel, sand, and more.Water can slowly destroy even the great mountain.And those stones, which are now easily found on the beach can be a part of the mountain, the former once great.
Earth - a grand creation, in which every detail is thought out.Over the centuries it has changed.There have been dramatic transformation of relief, and all that - under the influence of internal and external forces.In order to better understand the processes occurring in the world, be sure to know about the life she leads, not paying attention to the person.
