Explain with examples the ‘population size’ criteria used by most countries to define urban areas.
‘‘The knowledge about nature is extremely important to develop technology.’’ Support this statement by giving three examples.
Knowledge about nature is extremely important to develop technology:
(i)Understanding of concepts of friction and heat helped us discover fire.
(ii)Understanding of the secrets of DNA and genetics enabled us to conquer many diseases.
(iii)The laws of aerodynamics are used to develop faster planes.