Explanation:
All the spheres of the earth are connected including the geosphere and the biosphere. The biosphere depends on the geosphere (the rocks and minerals of the earth) mainly for nutrients required for growth and for habitat.
Due to this connection, therefore, if the harmful substance was to enter the geosphere, it would negatively affect the biosphere. It could be from the fact that if mineral of the substance is absorbed or taken up by organism of the biosphere, they die. This would destroy ecosystems and hence reduce the biosphere (the living component of the earth)
Learn More:
For more on spheres of the earth check out;
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