CBSE Class 7 Science Water: A Precious Resource Worksheets with Answers - Chapter 16 - PDF

The production, nature, and various phenomena of light are discussed in this chapter. This chapter is made enjoyable to study and understand using real-life examples, visuals, and activities. All topics in CBSE Class 7 Science are covered in depth to ensure that students have a thorough understanding of the subject. Concise and easy-to-understand explanations of topics and principles are provided. This answer summarises the CBSE Class 7 Science knowledge and skills as outlined in the most recent syllabus. Exercises have been properly rated to assist pupils in moving up and down each level.

Importance of CBSE Class 7 Chapter - 16 :

Water: A Precious Resource, Chapter 16 of Class 7 Science, covers everything about water. It informs students about the various types of water that exist on the planet. The abundance of water on our planet Earth is also discussed in the Water Class 7 notes. Students will learn about groundwater as well. It is, without a doubt, a vital supply of water. In the same way, students will be made aware of the underground water table's depletion. It focuses on the environmental distribution, with a particular focus on our country. It raises student awareness of their role in water conservation. Furthermore, the impact of water scarcity on plants is briefly explored in the water class 7 revision notes available on vedantu website.

How Much Water is There on the Planet?

Water covers 71% of the Earth's surface. However, living organisms are unable to consume all of this. Saline water makes up 97 percent of the earth's water, which is found in the oceans, while freshwater makes up 3% of the earth's water, which is found in ice caps, glaciers, and underground. Fresh water can be found underground, in rivers, and in lakes. Even then, only 1% of our freshwater is readily available, with the majority of it trapped in glaciers and snowfields.

Water in Its Various Forms:

• Solid state - On the surface of the world, water occurs in the solid state as ice and snow.

• Liquid state - Water can be found in a liquid condition in rivers, lakes, oceans, and underground.

• Water vapour exists in the atmosphere in a gaseous state.

Water Cycle in Environment:

The Water Cycle explains how water moves through the system. The water cycle is a natural occurrence that occurs on a constant basis on our planet. The water cycle keeps the amount of water on the planet constant. Evaporation, condensation, precipitation, and water collecting are the four steps of the process.

What is the Definition of Groundwater?

Groundwater is the water that is present underneath a location's water table. This water collects inside the soil due to a variety of factors: 

• Rainwater that pours on the land penetrates into the earth. 

• Water from rivers, lakes, and ponds frequently seeps into the ground, accumulating as groundwater.

Infiltration is the process through which water collects in the ground by travelling through the pores of the soil. Aquifer - An aquifer is an underground layer of rocks that contains water between fissures and empty places.

Groundwater Level Depletion: 

If humans continue to take out more water than is replaced by rainfall, the water table of a location may be depleted. Water table depletion can be caused by a number of factors, including:

• Increased Population - As the population of a region grows, so does the need for freshwater. This necessitates the use of additional water. In addition, a growing population necessitates the development of new dwellings, businesses, factories, buildings, and roadways.

• Many other factors contribute to water table depletion, including increased industries, agricultural activities, deforestation, and low rainfall.

Water Distribution:

Different elements such as rainfall and climatic conditions have little effect on the distribution of water across the globe. Some areas have a lot of water, while others have a lot of water scarcity.

Water Management:

Rainwater is normally allowed to flow away when it falls on the earth. It can, however, be conserved and utilised to restore the Earth's groundwater levels. Rainfall harvesting is the technique of keeping rainwater from flowing away and storing it for various uses such as refilling groundwater levels, home tasks, or industrial applications.