We have heard many stories about the history of the Earth, scientific studies claim different results about the Earth's existence. Recently a study conducted at the University of Maryland in the US have revealed the amazing history of the Earth. As per the study, Earth's first outer layer was hard, which later on folded and cracked due to which different continents came into existence. Which shows that It was the single shell previously. This happens due to the movement of tectonic plates of the Earth. Michael Brown, a professor at the University of Maryland in the US said, "Models for how the first continental crust formed generally fall into two groups: those that invoke modern-style plate tectonics and those that do not." Brown further said, "Our research supports the latter – a ‘stagnant lid’ forming the planet’s outer shell early in Earth’s history.” Also Read: Facebook's AI-based app will reduce the suicide rates Yahoo punishes its CEO Marissa Mayer for violating two security breaches RJio pre-paid and post-paid tariffs are out, chose the best one