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Activated charcoal: What is it? | Learn English phrasal verb 'come across'

Plain English

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How to Use the English Expression Come Across and We Have a Song of the Week

Activated charcoal starts as wood, sawdust or coconut shells. It's then treated with oxygen and heated to a very high temperature. The result is a fine dark grey, almost black powder called activated charcoal. But what is it and does it make any difference at all? In the second half of the audio lesson, I'll show you how to use the English expression come across.

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