What a relief — definition
The combination of unequal dry and hard surfaces of the earth called – relief. The word relief, is French in origin, in Latin sounds like «relevo», which means «to raise». What is the relief? Consider this concept in the geographical definition.
The topography consists of landforms that have different sizes relative to the horizontal plane and are divided into positive and negative. Positive relief forms are considered to be elevated above the horizon, such as hills, mountains, hills, plateaus. The negative shapes formed by the lower solid surface, such as depressions, valleys and ravines.
The origin of the relief
There is the concept of «agents of relief» that describes processes affecting the formation of the relief. These processes shape and develop relief for a long time, affecting the Earth’s surface, both inside and outside. The influence of internal (endogenous) is required heat energy comes from the Earth and affects the movement of the crust, and therefore formed faults and magmatism, folds and displacement of crustal blocks. The influence of exogenous or external obligation of solar energy.
The radiant energy at the Earth’s surface is converted into energy of water, air and other substances of the lithosphere. In fact, external processes of the formation of the relief is influenced by many factors such as the influence of water masses of the oceans, lakes, seas, ponds and streams current, strong wind gusts, dissolving ice blocks and other rocks, as well as economic activities of people or animals. All of these processes directly affects the formation of bumps and hollows of various shapes and sizes available on the earth’s surface.
The category of relief
Abrupt and smooth changes of the Earth’s surface, such as high mountain ranges, small hills and valleys and deep hollows on the bottom of the oceans and seas have in mind the existence of different categories of relief:
- Magurele. They differ in their globality. This is the oceanic bottom and ledges of the continents, which, even at first glance show us a sharp and fairly large-scale changes in the surface of the crust.
- The macro. Are not significant, but slightly smaller in size than megarelease and represent a strong indentations or hills against the horizon.
- Mesorelief. At a large scale changes in surface and occupy an intermediate stage between relief and microrelief.
- Microrelief – this is a relatively small embossed surface, such as canyons, valleys, gorges, steppe, fields and plains. Even the slightest changes in the Earth’s surface affect the formation of topography. The concept of nanorelief characterizes such minor differences of surface, such as nests or burrows of different sizes.
Geomorphology – the science that studies all internal and external processes of the Earth affect the education, formation and modification of the terrain.
As elevation affects the person’s life
The terrain varies a lot, so, for example climate, temperature, water availability, and vegetation (mountains, deserts, oases). It having theoretical knowledge about the nature of the terrain, people can learn all the necessary information about a particular continent or country. Also knowledge about all the features of the relief help people to choose a place for settlement, to build factories, houses, to build entire cities and to lay the highway.
As man influences the formation of the relief
Human activities are truly endless and very ambitious. So, using specialized equipment and special equipment, people have begun to change the terrain. The process of extracting from the Earth minerals, pumping gas, sand, water, construction and filling of artificial lakes and reservoirs not only greatly change the solid surface, but also adversely affect the natural terrain. As a result of these actions killed several layers of the Earth, and earthquakes, which sometimes have a strong destructive effect on all living things.
And so, the definition of what terrain can be described as a modification of the earth’s surface in one direction or another, that is, a set of depressions and protrusions (irregularities) in relation to the horizon, characterized by the principle of origin, sizes, shapes and age.