The Earth is continuously expanding. Research by scientists indicates that the actual volume of the Earth is much larger than previously thought, due to its ongoing expansion. Geologists studying data from both sides of the Mid-Atlantic Ridge have discovered that the ocean floor is constantly widening. Undersea volcanoes are continuously erupting, forming new crust, which pushes the old crust on the western side of the ridge, causing the ocean floor on both sides of the Atlantic to move relative to each other. This phenomenon led Wegener to propose the theory of continental drift, explaining how all the continents on Earth gradually separated and formed. As the ocean floor expands, the composition of materials inside the Earth changes, with the density of the core gradually decreasing, resulting in an increase in the Earth's volume. Due to this increase in volume, the Earth's rotation speed is also slowly decreasing. Research on coral fossils has shown that changes in the Earth's rotation period can be traced back hundreds of millions of years. For instance, 370 million years ago, a year was equivalent to 395 days as we know it today, while 200 million years ago, a year was only 385 days, and a day was just 23 hours long. Over time, the slowing of the Earth's rotation has gradually extended the length of a day. If this trend continues, in about 5 to 10 billion years, a day on Earth may resemble the length of a month today. This would undoubtedly have a significant impact on human life, but all of this is still a long way off.