Explain with examples the ‘population size’ criteria used by most countries to define urban areas.
Explain the term ‘Golden Quadrilateral’.
It comprises construction of 5,846 km long 4/6 lane, high-density traffic corridor to connect India’s four big metro cities of Delhi, Mumbai, Chennai & Kolkata . With the construction of Golden Quadrilateral, the time - distance and cost of movement among the mega cities of India will be considerably minimised.
‘‘The knowledge about nature is extremely important to develop technology.’’ Support this statement by giving three examples.