The Nature of Earthquakes
More than four and a half billion years ago, the Earth was formed as an independent planet. This is a scientific dating of its age. Since its formation, the Earth has been constantly undergoing geological changes. Continents are converging and diverging, seas and oceans are forming, mountains are growing. Recent NASA research suggests that the Earth is expanding. Activity inside the planet's crust bursts out into the surface in the form of volcanic eruptions and earthquakes. Energy carrying gigantic destructive force has always terrified people at all times. Underground forces destroyed entire cities in the ancient times.