* there is a lot of it
* earth has the right temperatures and pressures for water to routinely change state between solid, liquid and gas, giving us rain, snow, rivers, glaciers, etc. – most other substances are more static: they just sit in the ground or hang around in the atmosphere
* it’s a powerful solvent, meaning that many solids and gases readily dissolve in it, which allows them to undergo chemical reactions with other dissolved substances
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