describe the process of how black holes are formed

Explanation:A black hole can be formed by the death of a massive star. When such a star has exhausted the internal thermonuclear fuels in its core at the end of its life, the core becomes unstable and gravitationally collapses inward upon itself

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.

answer (a) more rain in u s and less rain in australia and asia