The Earth-Our World Test 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.