Use of polythene, rigifoam, shopping bags banned In a bid to make Sri Lanka polythene-free and find a sustainable solution to solid waste management, President Maithripala Sirisena has announced a number of measures including the ban on the import, manufacture and sale of lunch sheets and a ban on the use of polythene for decorations. Cabinet approval was granted on Tuesday for a series of measures proposed by the President in his capacity as the Minister of Mahaweli Development and Environment to gradually end the use of polythene and thus minimize its environmental impact. While banning polythene use for decorations the manufacture, sale and use of polythene of 20 microns or less for essential activities on the approval of the Central Environmental Authority CEA.
The ban on polythene that is equal to or less than 20 microns, in September , was a point of debate, of course, at the time it was implemented by the government. Besides the question of its efficacious enforcement, one can contemplate as to whether it has at least managed to reach the territories of the contemporary socio-political debates. Heroes and Villains - A little light reading. Here you will find a brief history of technology. Initially inspired by the development of batteries, it covers technology in general and includes some interesting little known, or long forgotten, facts as well as a few myths about the development of technology, the science behind it, the context in which it occurred and the deeds of the many. Indian Government has already banned plastic bags or polythene bags which is below 50 microns which means very low in weight. Polythene bags are widely used all over the world. The consumption of plastic bags is heavy and it is being circulated in all classes of people from higher to lower.
Explain how soil is formed. How Soil is formed: These include sand and clay. The relative amount of sand and clay depends upon the rock from which the particles were formed,and the local terrain. The mixture of rock particles, sand, clay and humus is called the soil.
In addition to these, living organisms, such as bacteria, plant roots and earthworm are also important parts of any soil. How is clayey soil useful for crops?
Clayey soil is good for retaining water. List the differences between clayey soil and sandy soil. Differences between clayey soil and sandy soil Clayey Soil Sandy Soil 1. The proportion of fine particles is relatively higher. The clayey soil is less aerated as clay particles, being much smaller, pack tightly together, leaving little space for air 3.
The clayey soil is heavy less air and more water content 4. It can retain good amount of water in the tiny gaps between the particles of clay 5. It is suitable for crops like Paddy, wheat and grams 1.
The proportion of big particles is relatively higher 2. The sand is well aerated as due to large particle size, they can not fit tightly to gether and have large spaces filled with air in between the particles.
The sand is light in weight 4. The sand is almost dry as it can not retain water due to large particle size. Sandy soil is suitable for pee nuts and sandy-loam is for cotton crops. Sketch the cross section of soil and label the various layers.
Razia conducted an experiment in the field related to the rate of percolation. She observed that it took 40 min for mL of water to percolate through the soil sample. Calculate the rate of percolation. As we know percolation rate of water is different in different types of soil.
It is highest in the sandy soil and least in the clayey soil. The rate of Water percolation is given by the following formula: Explain how soil pollution and soil erosion could be prevented.
Polythene bags and plastics pollute the soil. They also kill the organisms living in the soil. That is why there is a demand to ban the polythene bags and plastics.Ban On Polythene Bags Justified Polythene Pollution The Problem Of Polythene Pollution Polythene pollution is everywhere, and the problem is getting worse For most of us, the problem is seen as one of visual pollution, where plastic bags litter streets, roadways, and .
Heroes and Villains - A little light reading. Here you will find a brief history of technology. Initially inspired by the development of batteries, it covers technology in general and includes some interesting little known, or long forgotten, facts as well as a few myths about the development of technology, the science behind it, the context in which it occurred and the deeds of the many.
Tick the most suitable answer in questions 1 and 2. 1. Question: In addition to the rock particles, the soil contains (i) air and water (ii) water and plants.
The tube is lightweight and highly portable and provides water on demand, on site. There were many things we liked about it, but one of the things that really impressed us was the way it dealt with the different water pressures one has to cope with, so th. Management of Teak Plantations Overview of problems in teak plantation establishment - Dr.
Apichart Kaosa-ard. Apichart Kaosa-ard.
Forest Resources Department, Chiang Mai University, Thailand. The President was referencing an earlier ban on manufacture of polythene bags. “Banning the manufacture, distribution, sale and use is encompassing of the different promoters of these products.