2. What readings would you get from each of the positions A, B and C? What position of your eye will give an accurate reading? Why? Discuss the precautions one should take while measuring the length with the help of a ruler.
Answers
History is the scientific study of the past. Events occurring before the invention of writing systems are considered prehistory. "History" is an umbrella term that relates to past events as well as the memory, discovery, collection, organization, presentation, and interpretation of information about these events.
Answer:
Although air pollution affects high and low-income countries alike, low- and middle-income countries experience the highest burden, with the highest concentrations being seen in Central, Eastern Southern and South-Eastern Asia12.Magnesium oxide, or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium. It has an empirical formula of MgO and consists of a lattice of Mg²⁺ ions and O²⁻ ions held together by ionic bonding. Biomass is a organic fuel. Charcoal is obtained from burning of the wood. Biogas is obtained from organic wastes such as animal excreta, agricultural waste etc, Bio-diesel can be obtained from oil seed crops such as Jatropa.