On Earth Beginning the volcanic eruption and hot magma from the earth's core make the earth's surface hard and rocky. This made earth develop into the rocky planet that we know today.
The planets Mercury, Venus, Earth, and Mars are called terrestrial because they have a compact, rocky surfaces like mainland Earth. The terrestrial planets are the four innermost planets in the solar system.
The formation of rocky planets occurs over billions of years through a process called accretion. When a rocky planet creates matter by accretion, it becomes larger, increasing the temperature and pressure of its core.
When rocky planets form, planet-forming material gathers in a process known as "accretion." Along with the core pressure, it increases in size and temperature. The energy from this initial planet formation process heats and melts the elements of the planet.
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