Which statement best describes the theory of plate tectonics? Plates sometimes move closer to one another. Sections of Earth that shift are part of Earth's asthenosphere. Sections of Earth's continents are in slow, constant movement. Parts of the ocean floor move as they are carried by rift valleys.

The theory of plate tectonics posits that the Earth's outer shell, or lithosphere, is divided into several large and small tectonic plates that are constantly moving, albeit very slowly, on the semi-fluid asthenosphere beneath them. This movement can result in plates colliding, separating, or sliding past each other, leading to a myriad of geological phenomena such as earthquakes and volcanic eruptions. Interestingly, the theory of plate tectonics not only helps explain the formation of mountains and oceanic trenches but also has practical implications for understanding natural disasters. Geologists can better predict locations prone to earthquakes, leading to improved building designs and safety regulations. So, while tectonic plates seem like sleepy giants, they have a huge impact on our dynamic planet!