Chemistry.

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Atoms:

Atoms consist of electrons surrounding a nucleus that contains protons andneutrons.

Protons and neutrons have a relative mass of 1 and electrons have anegligible mass. Neutrons are neutral, but protons and electrons are electrically charged. Protons have a relative charge of +1 and electrons have a relative charge of -1.

Earth:

The Earth has a layered structure, including the core

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