Skip to main content

Chapter 18 Pollution of Water - Class 8 Science Solutions

Class 8 Science Solutions – Chapter 18 Pollution of Water

In the previous article, Air Pollution, its effects, and prevention methods from Pollution of Air and Water of Class 8 Science were discussed. Now, we will discuss water pollution, its effects, and prevention.


Water Pollution

We are surrounded by water in the form of rivers, lakes, ponds, oceans and even in the air present in the form of water vapours. It is one of the most abundant and main compounds on the Earth. 75% of the Earth’s surface is covered with water. The main sources of water supply are: –
  • Surface water from springs, waterfalls, rivers lakes, etc
  • Groundwater which is taken out from wells
  • Salty water
All living beings need water to carry out life processes. Therefore, it is called a supporter of the life but somehow due to human negligence, we are polluting water. The main causes of the water pollution are:-
  • Untreated industrial and domestic sewage in water bodies directly.
  • Draining of Inorganic pesticides and chemical fertilizers directly into the water by farmers. Some pesticides like DDT enter into aquatic animal bodies and eventually reach to human beings.
  • Animals bathing, washing clothes near water sources.
  • Leakage of oil from boats, ships etc pollute river and oceans.


Learn complete Chapter 18 Pollution of Water - Class 8 Science Solutions here...

Learn more topics 

Comments

Post a Comment

Thank you we will contact ASAP.

Popular posts from this blog

Allotment of DIN (Director Identification Number)

Allotment of DIN (Director Identification Number) CS professional course :  Section 153 of the Companies Act, 2013 read with Rule 9 of the Companies (Appointment and Qualification of Directors) Rules, 2014 Every individual intending to be appointed as a director as a director of a company shall make an application for allotment of Director Identification Number (DIN) to the Central Government in such form and manner and along with such fees as may be prescribed. Rule 9 of Companies (Appointment and Qualification of Directors) Rules, 2014 (1) Every Individual, who is to be appointed as a director of a company shall make an application electronically in Form DIR 3, to the Central Government for the allotment of a DIN along with such fees as provided in the Companies (Registration Offices and Fees) Rules, 2014. (2) The Central Government shall provide an electronic system to facilitate submission of an application for the allotment of DIN through the portal on the MCA21...
Post a Comment
Read more

PURCHASED GOODWILL METHOD UNDER IND AS 103

The acquisition of subsidiaries results in  Goodwill calculation  and also records net assets of the subsidiary at fair value on the date of acquisition. Let’s get answers to all the questions related to Goodwill, valuation of NCI, and impairment relating to them. Q1 – What are the ways in which an entity can make payment for purchase consideration? ANS: – Cash – Share exchange – Deferred payment – Contingent consideration Q2 – How is deferred payment dealt, when it forms part of purchase consideration? ANS:  The deferred payment is discounted to present value and included in the cost of consideration. At the end of each year, the liability is increased by unwinding the discount, until the payment is settled. For example, An amount of Rs. 108,000 was deferred to be paid after 2 years. The discount rate applicable is 8%. The net present value today of Rs. 108,000 is equal to (108,000 * 1) / (1.08) ^2)= Rs. 92,593 included in purchase consideration. A liability of Rs. 92,59...
Post a Comment
Read more

Contract of Guarantee important topic for CS Professionals

Contract of Guarantee important topic for CS Professionals For  CS Course  , Takshila Learning is offering CS Professional online classes for students in an easy, convenient, and simple way through our portal  www.takshilalearning.com .  It helps students to grab the conceptual knowledge in a different but simple way. CS online classes for CS preparation are a collection of HD-quality recorded lectures with the detailed explanation of the content by experienced and well-known faculties. An interesting topic from Drafting – ‘ Guarantees ’ is discussed below: Guarantees Contract of Guarantee A “ contract of Guarantee ” is a contract to perform the promise, or discharge the liability, of a third person in case of his default. A Guarantee may be either oral or written. Parties involved in the Contract Surety:  The person who gives the guarantee is called the  “surety”. Principal debtor:  The person in respect of whose default the gua...
Post a Comment
Read more