Following are some statements about pollution. which type of pollution do those express?
*Fog seems to be appearing in Delhi during day hours.
*Many times, vomiting and sedentary occurs after eating pani purity.
*problem of sneezing occurs sometimes during visit to garden.
*crop does not grow up in some areas.
*people living in the busy squares face the problems like short breathing and other respiratory problems.
Answers
As we look at our surroundings, we see a large variety of things with different shapes, sizesand textures. Everything in this universe ismade up of material which scientists havenamed “matter”. The air we breathe, the food we eat, stones, clouds, stars, plants andanimals, even a small drop of water or a particle of sand– each thing is matter. We canalso see as we look around that all the thingsmentioned above occupy space, that is, volume*and have mass.Since early times, human beings have been trying to understand their surroundings.Early Indian philosophers classified matter inthe for m of five basic elements – the
“Panch Tatva
”– air, earth, fire, sky and water. According to them everything, living or non-living, was made up of these five basicelements. Ancient Greek philosophers hadarrived at a similar classification of matter.Modern day scientists have evolved twotypes of classification of matter based on their physical properties and chemical nature.In this chapter we shall learn about matter based on its physical properties.Chemical aspects of matter will be taken upin subsequent chapters