A. i just read about this in my history book for school.
The Proterozoic division of the geological time scale is an era of the Phanerozoic eon. The Proterozoic division began 2.5 billion years ago and ended 542.0 million years ago.
Act like it is a real baby.
The processes of extracting and separating gold in remote regions often result in environmental contamination with Cyanide (Option B).
<h3>What is cyanide?</h3>
Cyanide is a substance that contains a group formed by Carbon and Nitrogen forming a strong chemical bond (C≡N).
Cyanide can be very toxic when forms soluble salts (e.g., sodium and/or potassium cyanide).
Cyanide was used as a chemical compound during gold extraction, thereby generating environmental contamination.
Learn more about cyanide contamination here:
brainly.com/question/220829
Go to the app store if you’re on a apple device click on the icon on the top right of your screen go to subscriptions then cancel
