Bell Ringer â AP Practice
Bell Ringer â AP Practice
Bell Ringer â AP Practice
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Step 1: Weathering<br />
• The vast majority of the earth’s phosphorus is<br />
in the form of rock and is released by<br />
weathering.<br />
• Phosphate ions (PO<br />
3-<br />
4 ) are<br />
released by weathering<br />
and enter water systems.