CBSE Class 7 Science Chapter 18 Notes Wastewater Story
CBSE Class 7 Science Chapter 18 Notes Wastewater Story Forests: Our Lifeline Class 7 Notes Understanding the Lesson 1. Rich in lather, mixed with oil, black-brown water that goes down the drains from sinks, showers, toilets, laundries is dirty. This is called wastewater. 2. The suspended impurities in water are called contaminants. 3. The waste…
Read more