Core
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Example:
Imagine trying to find the source of warmth in a cozy, heated room on a cold winter day. Just like the heater is hidden away but essential for keeping the room warm, the Earth's core is hidden beneath layers but is crucial for the planet's heat. The heater in the room is analogous to the Earth's core, as both are central sources of heat that influence their surrounding environments, even though they are not directly visible.
Practice Version
Core: The central part of the Earth, below the mantle, is called the core. The core is the hot, dense center of our planet made mostly of iron and nickel.