Recently, there has been a concern over the short supply of a group of elements called 'rare earth metals'. Why?

With reference to India, consider the following statements: 1. Monazite is a source of rare earths. 2. Monazite contains thorium. 3. Monazite occurs naturally in the entire Indian coastal sands in India. 4. In India, Government bodies only can process or export monazite. Which of the statements given above are correct?

Ilmenite and rutile, abundantly available in certain coastal tracts of India, are rich sources of which one of the following?

About three-fourths of world's cobalt, a metal required for the manufacture of batteries for electric motor vehicles, is produced by