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The plates move occasionally toward and occasionally away from one another due to the heat produced by radioactive processes occurring within the planet's interior. Tectonic shift is another name for this movement.
There are three major layers that make up the Earth. Yellow represents the dense, hot inside core, orange the molten exterior core, red the mantle, and brown the thin crust, which is home to all known forms of life. The extremely hot and dense core of our planet is called the Earth's core. Despite their differences from Earth, they discovered that all other planets should have a nickel/iron core that makes up around 30% of the planet's mass. In contrast, the Earth's core contains nearly one-third of its total mass. Similar to Earth, the mantle and crust would make up the remaining portions of each planet. The inner planets, often known as the terrestrial planets due to their similarity to Earth, are the four planets Mercury, Venus, Earth, and Mars that are nearest to the sun. The relative diameters of these four planets are depicted in Figure 25.7. In comparison to the outer planets, all of the inner planets are small.
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