Most of the material returned to Earth. As this debris collected it formed our Moon. The outer planets where it is cooler are still dominated by lighter elements. As the planets formed they became greatly heated by numerous meteorite impacts and by gravitational collapse. During this early phase when the inner planets were molten they differentiated to form an internal layering.
Earth is unique among the planets in that it is dynamic and changing.
It has oceans, it has an atmosphere, and it is tectonically active. Most importantly, it has life including creatures such as ourselves that can try to understand it. Much of the Moon's surface has remained unchanged for billions of years. The Tectonic Cycle is driven by Earth's internal heat and gravity, this cycle builds up Earth's surface, creates volcanoes, earthquakes, and mountains. The thin outer layer of Earth.