Most of the wool in the market is made from the fleece of sheep. A sliver is a long bundle of fibre that is generally used to spin yarn. A sliver is created by carding or combing the fibre, which is then drawn into long strips where the fibre is parallel. When the sliver is drawn further and given a slight twist, it becomes roving.

Describe the Green House effect.

Greenhouse effect is the process by which the sun's radiations are absorbed by the greenhouse gases present in the atmosphere of the earth and are not reflected back into space. This phenomenon insulates the surface of the earth and prevents it from freezing.” During the day the sun heats up the earth’s atmosphere. At night, when the earth cools down the heat is radiated back into the atmosphere. During this process, the heat is absorbed by the greenhouse gases in the earth’s atmosphere. This is what makes the surface of the earth warmer, which makes the survival of living beings on earth possible. However, due to the increased levels of greenhouse gases, the temperature of the earth has increased considerably. This has led to several drastic effects like the global warming and depletion of ozone layer.