(a) The deepest point on the earth is the Mariana Trench in the Pacific Ocean. The depth of the Mariana Trench is approximately 10,994 meters below sea level.

(b) The Indian Ocean is named after a country. No other ocean on the Earth has been named after a country. It is the world’s third largest ocean and covers 20 per cent of the Earth’s surface.

(c) The Biosphere is a narrow contact zone of land, water and air that supports life. This layer ranges from heights of up to ten kilometers above sea level, to the depths of the oceans. Biosphere consists of the three domains on the Earth, namely, Land, Water and Air.

(d) The continents of Europe and Asia together are known as Eurasia. Most of the continents on the Earth are separated from each other by oceans, but the continents of Europe and Asia are not separated by any water body. They are, therefore, together known as Eurasia.

(e) The highest mountain peak on the earth is Everest. Mount Everest is located on the border of Nepal and Tibet in the Himalayan mountain range. It is 8848 meters above sea level.