Define environmental harmful substances​

An environmental hazard is a substance, state or event which has the potential to threaten the surrounding natural environment or adversely affect people's health, including pollution and natural disasters such as storms and earthquakes.

platics, polythin ,fertilizers ,

Explanation:

plastics and polthines are harmful substances for the environmental because they cannot be remove from the earth and they are very hard and cannot be destroyed and make a harmful effect for the health

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explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.

sir frederic attributed inaccuracies to schemas. memory reconstruction is one part actual events and one part personal schema, which can result in inaccuracies when memories are reconstructed.