Explanation:
B & C. Plato communicated his work through conversations and letters.
The environmental impact of mining<span> includes </span>erosion<span>, formation of </span>sinkholes<span>, loss of </span>biodiversity<span>, and </span>contamination of soil<span>, </span>groundwater<span> and </span>surface water<span> by chemicals from </span>mining<span> processes. Besides creating environmental damage, the contamination resulting from leakage of chemicals also affect the health of the local population</span>
In 1787, the Constitutional Convention delegate's worked for about six hours a day, all through the summer. Therefore, C is the correct option.
<h3>What was the constitutional convention of 1787?</h3>
The constitutional convention of America officially started on May 14 1787 to 24 September 1787. The constitutional convention met regularly in order to frame the first written constitution of the world. The constitution fathers decide in this convention how the United States of America would be governed. Many participants of the conventions had much bigger plans for the country although many wanted to only modify the existing articles of confederation for the time being.
Thus, throughout the summer of 1787, the delegates to the Constitutional Convention put in about six hours per day of work. C is therefore the best choice.
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