How was the development of the Earth's human?It was a very difficult and lengthy process.Even now, we can not say that our planet is studied by 100%.So far, there are pieces of nature that are untouched by human hands.
Learning development land 7 class of secondary school.This knowledge is very important and help to better understand the history of civilization.
How was the development of the Earth's human?
first stage of settlement, in which the ancient bipedal humans began migrating from East Africa to Eurasia and to explore new lands, began about 2 million years ago and ended 500,000 years ago.Later, the ancient people are dying, and with the emergence of Homo sapiens in Africa 200,000 years ago, the second stage.
main resettlement of people was observed along the mouth of large rivers - the Tigris, the Indus, the Euphrates, the Nile.It is in these places and the first civilization arose, which were called the river.
Our ancestors chose such sites in order to break the settlements, which later will become the centers of.Their life was subordinated to clear the natural regime.In the spring of the river spilled, and then, when they are dried up, this place has remained a fertile moist soil, ideal for seeding.
Settling on continents
vast majority of historians and archaeologists believe the birthplace of the first people to Africa and South-western Eurasia.Over time, mankind has mastered almost all the continents except Antarctica.There is now the Bering Strait 30,000 years ago, was dry land that connects the Eurasia and North America.It was on this bridge people penetrated into all new and new places.For hunters from Eurasia, passing through North America and fell in its southern part.In Australia, people came from Southeast Asia.Such conclusions scientists have been able to do on the basis of the results of the excavations.
main resettlement
When considering how a man going land reclamation will be interesting to see how people choose places for his residence.Very often entire communities left corner of the familiar and the unknown were sent to search for the best conditions.Mastered new lands allowed to develop animal husbandry and agriculture.It grew rapidly and the population of the planet.If 15,000 years ago, the world population of about 3 million people, now this figure exceeds 6 billion.The vast majority of people living in the lowland areas of the terrain.They are convenient to divide the field, to build factories and plants, develop settlements.
on the globe can be identified four areas where the resettlement of people in the most dense.It is Western Europe, South and East Asia, eastern North America.To do this, have their own reasons: favorable natural factors, the duration of the settlement and development of the economy.For example, the Asian population is still actively seeded and irrigated soils.Favorable climate allows you to collect a few harvests a year to feed a large family.
In Western Europe and North America dominated the urban settlement.It is very well developed infrastructure, built many modern factories, industry dominates agriculture.
Economic activities
Economic activities affect the environment and changes it.And the various sectors affected by the nature in different ways.
So, agriculture was the primary cause of the reduction areas of the planet, which preserves the natural conditions.For fields and pastures needed more space, cut down the forests, the animals lose their home.Because of the constant load soil partially loses its fertile quality.Artificial irrigation allows you to get a good harvest, but this method has its drawbacks.Thus, in the arid regions of the earth too much water may result in salinization and reduction of yield.Pets trampling vegetation and compacted soil.Often, the dry climate pastures are turning into deserts.
particularly harmful to the environment the rapid growth of the industry.Solid and liquid substances to penetrate into the soil and water, and gases released into the air.The rapid growth of cities is the need to learn all the new territories where the vegetation is destroyed.Environmental pollution is extremely adversely affects the health of people.
land reclamation person: countries
People who live in the same territory, have a common language and one culture, ethnicity form.It may consist of a nation, tribe, people.In the past, the great ethnic groups created a whole civilization.
Currently the world there are more than 200 countries.They all differ.There are states, which occupy an entire continent (Australia), and there are very tiny, consisting of one city (Vatican).Different countries and population.There are state-billionaires (India, China), and there are those that are home to more than a few thousand (San Marino).
So, considering the question of how a man going land reclamation, we can conclude that this process is not yet complete, and we have to learn a lot more interesting things about our planet.
