What is the "downside" to extensive use of synthesized nitrogen-containing fertilizers?

An extensive use of synthesized fertilizers can cause over fertilization as then the nutrients are readily available to the plant. The repeated use of these fertilizers can promote alagal growth,  build up of toxic chemicals like arsenic, cadmium, and uranium in soil. These harmful chemicals can indirectly reach your body through fruits and vegetables. It can also change the PH of the soil. Furthermore, the extensive use of these fertilizers can release greenhouse gases and attracts pest.

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.