Answer:
Explanation:
The materials that are useful are bamboo, plastic, steel, concrete, fabric , textiles, stones, brick, repurposed wood e.t.c.
Materials become useful, when those that uses it use it right and to achieve a specific purposes base on the properties the materials poseses.
The materials that are harmful include asbestos, Mercury containing devices, lead based paints, household hazardous waste, light system, mold, refrigerant containing system.
Materials become harmful when they contain substances or properties that is dangerous or can harm human beings and cause damage to cells.
Answer:
i think c sorry if im not correct!!
Explanation:
Probably to not contaminate food or accidentally poison it.
This question has a two part answer. The first part is that an asteroid hitting the earth and the second part is massive volcanoes erupting around the world.
The Zhou dynasty (1046 BC to approximately 256 BC) was the longest-lasting dynasty in Chinese history. By the end of the 2nd millennium BC, the Zhou dynasty began to emerge in the Yellow River<span> valley, overrunning the territory of the Shang. The Zhou appeared to have begun their rule under a semi-feudal system.
</span>History of China - Wikipedia<span>https://en.wikipedia.org/wiki/History_of_China</span>