Water: An important natural resource

This concept mainly explains the importance of water as a natural resource. Here the students will be introduced to different sources of water like surface water and underground water. The students will know about different types of irrigation like drip irrigation and sprinkler irrigation system.

After reading the concept, students will be able to:

• Enlist domestic use of water
• Explain uses of water in agriculture
• Recall the industrial uses of water.
• Analyse surface water sources and sources of underground water.
• Understand the importance of water in human body.
• Know what is water cycle and analyse different aspects of it like
  • What is evaporation?
  • Condensation of water vapour.
  • What is precipitation?
  • Collection of water.

 

Each concept is explained to class 4 students using descriptions, illustrations, and concept maps. After you go through a concept, assess your learning by solving the two printable worksheets given at the end of the page.

Download the worksheets and check your answers with the worksheet solutions for the concept of Water—An Important Natural Resource provided in PDF format.

What is a Natural Resource?

• A natural resource is a material from the earth used to support life and meet people's needs.
• In simpler words, we can say that any natural substance humans use can be called a natural resource.

Examples: Air, water, wind, soil, forests, coal, petroleum, etc.

Water as a Natural Resource:

Water is an essential renewable natural resource because of the following reasons—

• It helps maintain an ecological balance as all living beings require water to survive.
• It helps in sustaining life.
• It is crucial for respiration in the case of aquatic organisms because oxygen remains dissolved in water.
• Plants require water to perform photosynthesis.
• Water is called the ‘universal solvent’ because many substances dissolve in it.

Sources of Water:

• Surface water is any waterbody found on the earth's surface that includes seas, oceans, rivers, streams, and lakes.
• Underground water (also called groundwater) is the water found in soil, sand and rocks.

Sources of Surface Water:

 

1. Rivers and Lakes:

• In the case of rivers and lakes, the water flows on the surface of the earth.
• Rivers are flowing masses of water that drain into seas or oceans, whereas lakes remain surrounded by land from all sides.
• The water from rivers and lakes is suitable for domestic use after properly purifying.

Sources of Underground Water:

• The primary source of underground water is rainwater.
• Rainwater is collected on the earth’s surface and gradually infiltrates through the soil layers and rock beds.
• This water seeps through the pores of the soil and the cracks of rocks.
• The rainwater accumulates to make a water reserve underneath the soil layer which can be extracted using hand pumps and motor pumps.
• Deep tube wells and wells also help us collect groundwater.

Role of Water in the Human Body:

Uses of Water:

 

1. Domestic Uses of Water:

 

2. Agricultural Uses of Water:

Water Cycle:

The water cycle is the path that water follows as it moves around the earth in different states, namely solid, liquid and gas. It is a complex system that involves the following steps—

1. Evaporation:

2. Condensation:

New Words:

 

Did You Know?

• 70% of the human brain is nothing but water.
• Water is the only substance on earth found naturally in three states of matter—liquid, solid and gas.
• Despite water covering 71% of the planet’s surface, more than half the world’s population faces extreme water scarcity. Current data predicts that by the year 2040, up to 20 more countries could be experiencing water shortages.