What is the name of the system of measurement used by most countries
around the world?

The International System of Units

Explanation:

(SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system. It is the only system of measurement with an official status in nearly every country in the world.

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igneous rock formed from below the surface would have more crystals because

answer: because magma cools more slowly than lava

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