Why are the plates of the earth like a jigsaw puzzle and float like ice in a punch bowl?

The Earth's tectonic plates resemble a jigsaw puzzle because they fit together at their edges, forming a mosaic of land and ocean across the planet's surface. They float on the semi-fluid asthenosphere, much like pieces of ice float in a punch bowl, due to their lower density compared to the molten rock beneath them. This buoyancy allows the plates to move slowly, driven by convection currents in the mantle, leading to geological phenomena like earthquakes and volcanic activity.