Tailings are dangerous because they can

a. release toxic elements into the groundwater or surface water

b. be very explosive

c. increase the chances of a volcanic eruption

d. decrease the amount of nonrenewable resources available

Its A= They can release toxic elements into the groundwater or surface water, hope this helped you out some bit :)

Hydrosphere is the correct answer

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.