Notes on lesson on Our Earth |

Our Earth


Introduction to Earth

Earth is the largest planet of all the terrestrial planets of the inner solar system. It is bigger than Mercury, Venus and Mars. Earth is the only planet in the solar system known to harbor life. Earth's atmosphere protects us from meteors, most of which burn up before they can strike the surface. The earth can be exactly represented by a globe.

Latitudes and Longitudes

Latitude and Longitude are the units that represent the coordinates at geographic coordinate system. The latitude has the symbol of phi, and it shows the angle between the straight line in the certain point and the equatorial plane. The longitude is defined as an angle pointing west or east from the Greenwich Meridian, which is taken as the Prime Meridian. The longitude can be defined maximum as 180° east from the Prime Meridian and 180° west from the Prime Meridian.

Topography and Climate of Nepal

Nepal is mountainous Country. There are about 6000 streams and rivers in Nepal. Most of the big rivers of Nepal are originated from the snow capped himalayas in the north. Our Country Nepal is divided into three major physical regions. The Himalayan region lies in the northern part of the country. The Hilly region lies in the southern part of the mountain region. It is the rich region for green landscapes and for nice fields. The Terai lies in the southern part of the country. It covers 17% of the total land.

Social life of Nepal

Nepal is a home land of several ethnical groups it has common social family structure. The life style of Nepalese people differs from Terai to Himalayan region. Himalayan region is always covered with snow. The southern part of this region is less cold. The climate of this region is cold, dry and windy. The Hilly region is situated in the central part of the country. It spreads from Mechi in the east to Mahakali in the west. It has high hills and rocks. The terai region lies in the southern part of the country. Many people live in this region due to the plain land and fertile soil. The people also rear cattle which provide them with milk, cheese, ghee, eggs, and meat. People of this region speak Tharu, Maithali, Bhojpuri, Avadi, etc.

Continent of Asia

Asia is the largest continent of the World. It is also known as the most mountainous continent in the World. Ten of the World's higest peaks are found in Asia. The largest plateau known as the 'The plateau of Tibet' is in Asia. It is surrounded by oceans on three sides- the Arctic ocean in the north, the Indian ocean in the south and the Pacific ocean in the east. Asia is located between 10oS to 80o N Latitudes and between 25oE to 170oW Longitudes. It is located in the east of Europe, north of the Indian Ocean.

Climate Change

Climate change refers to the significant change in the average weather in due course of time on the earth or in any parts of it due to the fluctuations in atmospheric, temperature, wind flow, rainfall etc. As we know that the melting of snows on the Himalayas is increasing. The main factor to this climate change is nobody but the human itself. It is our duty to control Green House Effects. We have to reduce the use of Carbon-dioxide items like Petroleum products, coals etc. The whole world has to come together for the reduction of Climate change.