1. What is environment?
The place, people, thing and nature that surround any living organism is called environment.
2. What is lithosphere?
It is the solid crust or the hard top layer of the earth. It is made or rocks and minerals and covered by a thin layer of soil.
3. What are the components of lithosphere?
Lithosphere is the domain that provides us forests, grasslands for grazing, and land for agriculture and human settlements. It is a source of rich mineral wealth.
4. What is hydrosphere? What does it contain?
The domain of water is called hydrosphere. It consists of various sources of water and different types of water bodies like rivers, lakes, seas, oceans, etc.
5. What is atmosphere?
It is the thin layer of air that surrounds the earth. The gravitational force of the earth holds the atmosphere around it.
6. How does atmosphere protect us?
It protects us from the harmful rays and scorching heat of the sun. It consists of a number of gases, dust and water vapour. The changes in the atmosphere produce changes in the weather and climate.
7. What is biosphere?
Plant and animal kingdom together make biosphere or the living world. It is a narrow zone of the earth where land, water and air interact with each other to support life.
8. What is an ecosystem?
It is a system formed by the interaction of all living organisms with each other to support life.
9. What is barter system?
It is a trade in which goods are exchanged without the use of money.