Is Singapore a separate country? Does it make part of any other place?

Singapore gained self-governance in 1959, and in 1963 became part of the new federation of Malaysia, alongside Malaya, North Borneo, and Sarawak. Ideological differences led to Singapore being expelled from the federation two years later, becoming an independent country.

Explanation:

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.