- The Earth in the Solar System
- Globe: Latitudes and Longitude
- The Motions of the Earth: Rotation and Revolution
Here we will understand i.e. Major Domains of the Earth which is also chapter 5 of Class 6 Geography NCERT.
- Mother Earth = Lithosphere + Hydrosphere + Atmosphere + Biosphere
- Earth gives us land to live, water to drink and air to breathe
- The solid, brittle outermost layer of the earth surface.
- It includes: Thin layer of soil Earth Crust + Upper Mantle (will study later)
- Basically, it is a solid portion of the earth where we are standing right now.
- Continents: Huge landmasses
- Ocean Basins: Large water bodies
- Asia: Largest and most populous. Lies in the eastern hemisphere, tropic of cancer passes through this continent. Asia separated from Europe by the Ural Mountains.
- Europe: Much smaller. Arctic circle pass through it.
- Africa: the second largest. Only continent through which the tropic of Capricorn, tropic of Cancer and equator passes + Sahara dessert in the north.
- North America: Third largest. Connected to South America by Isthmus of Panama. The Rocky Mountains at the west.
- South America: Mostly in the southern hemisphere. The Andes are located here.
- Australia: Smallest continent. Entirely in the southern hemisphere.
- Antarctica: Huge. Permanently covered in thick ice sheets. No permanent human settlement here. India has research stations here known as Maitri and Dakshin Gangotri.
- Gaseous layer
- Consist of oxygen + nitrogen + carbon dioxide and other gases
- It is a dynamic mixture of gases that surrounds the earth
- The hydrosphere includes water in all forms i.e. ice + water + water vapour
- Blue Planet: 71% of the earth is covered with water and 29% is with the land.
- More than 97% of water is found in the land and too salty.
- Despite being blue water planet we are facing a water crisis.
- Oceans are major part of the hydrosphere. Also, oceans have 3 important movements – waves, tides and ocean currents that we will study in later part.
- Pacific: Largest. Spread over 33% of the earth. Mariana Trench the deepest point on the earth. Circular in shape.
- Atlantic: S shaped. Flanked by America and Africa + Europe. Highly indented coastlines are good for natural harbours.
- Indian: Only ocean named after a country. Triangular in shape.
- Southern: Encircles Antarctica up to 60 degrees south latitude.
- Arctic: Located within the arctic circle and surrounds the North Pole.
- A layer of Gas called atmosphere surrounds the earth.
- It protects us from harmful rays.
- Moreover, it provides us with the air we breathe.
- As altitude i.e., height increases the density of atmosphere decreases. It maxes at sea level.
- Wind: Moving air is called wind.
- Based on composition, temperature and some other properties atmosphere is divided into 5 layers-
- We will study them in detail in the next standard possibly in next week ?
- It is the narrow zone of contact between the land, water and air.
- This zone is unique to planet earth.
- Earth supports various organisms – ranging from microbes to mammals
- The organisms of the biosphere can be further divided in
- Plant Kingdom
- Animal Kingdom
To, conclude all these domains are interconnected. Mankind should limit the use of resources and maintain harmony between these domains.
A. Which Mountain Range Separates Europe from Asia?
- The Appalachian
- The Ural
- The Pamir Knot
- The Atlas
B. India and Sri Lanka are Separated by-
- An Isthmus of Palk
- Suez Canal
- Malacca Strait
- Palk Strait
C. Why there is carbon dioxide in the atmosphere?
- because of industrialization
- Emission of GHGs from vehicles
- Burning fossil fuel & Wood + Deforestation
- All of the above
D. How much per cent of CO2 is present in the atmosphere?
E. Where on the earth sun’s rays reach with oblique angle?
- All of them
Watch the video here.