Answer:
The inner planets—Mercury, Venus, Earth, and Mars—are believed to have been formed by the combining of asteroid-sized debris
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Explanation:
Mercury, Venus, Earth and Mars are closer to the Sun and therefore are located in the inner Solar System. The structure of the inner planets is believed to be similar, namely, with a solid crust, a mantle of liquid matter and, at the bottom, a core of liquid iron. Characteristic of these planets is that its surface is scarred by impact craters from meteorite strikes, but on Earth these traces have eroded. Especially Venus and the Earth have an active geology where volcanic eruptions and earthquakes are constantly changing the planet's surface.
These planets were created after volatile elements and compounds crashed between each other and condensed near the sun, while volatile gases were torn away by the strong solar wind.
