In order to protect aquifers near landfills, material is placed under the soil to prevent pollution. which following property must the protective material possess? a) high porosity b) low permeability c) high reflectivity d) low conductivity

b) low permeability

Explanation:

In landfills, materials with low porosity and low permeability are often placed under the soil to prevent pollution.

Permeability deals with the inter-connectivity of pore spaces within a rock or soil unit. Permeability aids the movement or transmission of fluids within the pores of a rock. When pore spaces are interconnected, permeability increases. This would eventually lead to leaking of dissolved materials from the landfill into the ground water system and can contaminate the environment.

answer: i dont know the answer but this might

explanation:

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answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.