Chapter 7
Earth and Its Resources
science, class 4
Questions 1,2,3,4,5,6,7,8,9,10
PTBB, Pakistan 2023 SLO's
Topics covered in questions
Question:1
Chapter 7 Earth and Its Resources, science, class 4, Questions 1,2,3,4,5,6,7,8,9,10 PTBB, Pakistan 2023 SLO's Topics covered in questions
Explain that earth's surface is made up of land and water and is surrounded by air?
Answer:
If you look at the globe of the Earth, you will see that most of the area is blue which represents water. You will see a small area that is green or khaki, which indicates dry land. The Earth's surface consists of land water. The Earth is surrounded by air or wind. About 71% is water on Earth and remaining is land. Although we do not see air, it is present everywhere on Earth even in soil and water.
Question:2
How does water in rivers and streams flows from mountains to oceans or lakes?
Answer:
About 97% water present on Earth is in the oceans. The remaining water 3% is present in form of glaciers, rivers, streams and lakes. Rainwater is added in rivers and streams. From here, the water flows to lakes and oceans. The snow falling on mountains also melts and becomes water. This water also flows to rivers and streams and finally falls into lakes and oceans.
Question:3
What are Earth's Natural resources?
Answer:
The Earth is rich in may natural resources including water, air, soil, forests, coal, oil, natural gas and minerals, etc. We use natural resources to make different things in our daily life. The properties of natural resources make them useful for a variety of purposes. For example, clay is used to make bricks and pottery while sand is commonly used to make building and glass.
Question:4
Define how natural resources water, Air, soil, forests are useful to us?
Answer:
Water:
All living things need water to survive. We use water for drinking, cooking, bathing and washing clothes and dishes. Water is also very useful for plants and crops. Running water is also used to generate electricity.
Air:
Air is very important for the survival of life on Earth. Air is present all around us. It is present in soil and water due to which living thins in water can breathe. Fast blowing Air is used to generate electricity using wind mill.
Soil:
Soil is outer layer of the Earth which contains water, Air, fertile matter and gravel. Soil provides essential nutrients to plants for growth. It also provides shelter to many organisms. It is also used to make bricks, glass and utensils.
Forests:
The part of the Earth that is completely covered with trees is called forest. Forests not only provides us timber but also natural habitats for animals. They also provide us fresh and oxygenated air.
Question:5
Define how natural resources Natural gas and oil, minerals are useful to us?
Answer:
Natural Oil:
Crude oil found underground, is a major source of energy for humans. We use this oil as fuel in vehicles and other means of transport. We also generate electricity by burning this oil.
Natural Gas:
Natural gas obtained from earth is used heating and to generate electricity. Natural gas is used as fuel to cook in homes. It is also used to make fertilizers.
Minerals:
The solid non-living chemicals present in the Earth is called minerals. They are obtained by digging the Earth. Gold, silver, copper, iron and salt, etc. are all minerals. They are used to make many items such as wires, coins, jewelry and utensils. Mineral coal is also an important natural resource that is used as a fuel.
Question:6
What are fossils?
Answer:
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| Chapter 7 Earth and Its Resources, science, class 4, Questions 1,2,3,4,5,6,7,8,9,10 PTBB, Pakistan 2023 SLO's Topics covered in questions |
Have you ever noticed that when you walk on soil, your footprints are imprinted on it? Can these footprints be preserved forever? Thousands of year ago, there were many organisms that do not exist in these days but their imprints or remains are found under rocks, soil and sea. These imprints or remains are called fossils.
Question:7
Differentiate between renewable and non-renewable resources?
Answer:
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Renewable Resources:
Those unlimited resources which can be replaced after use are called renewable resources. Air, Water, Soil, forests and solar energy are called renewable resources. Some of these resources are also used as fuel substitutes.
Non-Renewable Resources:
Some natural resources such as coal, petrol, diesel and natural gas take millions of years to form. Such limited resources are called non-renewable resources. Once they are used, they con not be replaced easily.
Question:8
Investigate the impact of human activities on the Earth's natural resources?
Answer:
The lavish use of natural resources is causing irreparable damage to our environment. Growing population, excessive use of fossil fuels and deforestation, etc. are rapidly reducing land resources. Due to it, humans are facing problems such as climatic change, pollution and lack of clean drinking water.
If we do not use natural resources carefully then a stage will come when renewable resources like trees, animals, soil, water and air will also run out or will become unusable. That is why we must use natural resources carefully. We also take steps to preserve the natural resources.
Question:9
Suggest the ways to conserve the natural resources?
Answer:
All living things depend on natural resources. We should take these steps to conserve natural resources:
1.Plant trees on large scale. Trees not only provide oxygen but are also natural habitats for many animals.
2. Recycle paper, plastic, glass and other materials instead of throwing them away. Recycling saves natural resources by reusing such items.
3. Use renewable resources such as wind , water and solar energy to generate electricity.
4. Protect air, water and land from pollution,
5. Use water and electricity carefully.
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