The Rub al Khali about the same size .

Formal operational stage of cognitive development

Explanation:

Formal operational stage of cognitive development is the level of Piaget's theory of cognitive development where a person is able to generate hypothesis about world and things for answering issues.For solving certain problem, best predictions are made regarding to it in a systematic and orderly manner.

This type of thinking is considered scientific rather than hit and trial method because meaningful ,relatable and valid guesses are made in accordance with the question or problem.Then best way for solving problem is then concluded.