WBBSE Class 6 Geography Chapter 2 Is the Earth Round Introduction
1. A part of the circumference of a circle is called an arc.
2. The radius of a circle is the distance from the center of a circle to any point in the circumference.
3. A round solid figure that has three dimensions and is shaped like a ball is called a sphere. For example, the Earth is a sphere.
4. The distance from the centre of a sphere to any point on the surface is called the radius of a sphere.
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5. The line along which the sky appears to 5. meet the surface of the Earth, is known as the horizon.
6. Although the shape of the Earth has some similarities with an orange or pear, the actual shape of the Earth is as unique as the Earth. This shape is called a geoid.
7. The highest point on the Earth’s surface is Mount Everest in the Himalayas, which is 8848m above sea level.
8. The lowest point on the Earth’s surface is the Mariana Trench in the Pacific Ocean, which is 10,915m below sea level.