Test: The Earth-Our World- 2

• Earth is the only planet in our solar system which has all the favorable conditions for the existence of life.
• The climate of the earth is neither too hot nor too cold.
• Our Earth consists of water and air.
• These two components i.e. water and air are the most essential for our survival.

By most standards, Earth has seven continents: Africa, Antarctica, Asia, Australia/Oceania, Europe, North America, and South America.

Southern Ocean, also called Antarctic Ocean, body of salt water covering approximately one-sixteenth of Earth's total ocean area.

• A globe is a spherical model of Earth, of some other celestial body, or of the celestial sphere.
• A model globe of Earth is called a terrestrial globe.

• "Political maps" are among the most widely used reference maps.
• They are mounted on the walls of classrooms throughout the world.
• They show the geographic boundaries between governmental units such as countries, states, and counties.
• They show roads, cities and major water features such as oceans, rivers and lakes.

71% of the earth's surface is covered with water; 29% is land. Most of the 71% that is covered in water is oceans.

• There are two main divisions of the earth's surface.
• The large landmasses are known as the continents and the huge water bodies are called the ocean basins.

Africa, the second-largest continent, covers an area more than three times that of the United States.

The Sahara Desert is the largest hot desert in the world, and the third-largest overall after the Antarctica and the Arctic.

The Isthmus of Panama in Panama links the continents of North and South America, and separates the Pacific and Atlantic Oceans.