The superlative form of heavy; weighing the most or being the most burdensome.
From Old English 'hefig,' possibly from Proto-Germanic 'hafjan' meaning 'to lift.' The -est suffix creates the superlative form (heaviest, rather than heavy or heavier).
The heaviest elements on Earth are at the core—gold and iron sink downward while lighter elements float up, which is how planets organize themselves and why Earth's core is hotter than the sun's surface.
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