Microbes cannot break non biodegradable substances because enzymes are specific in their action, they only break down specific substances, like plastics are non biodegradable.
NO there will be no affect if they get ** under the land for a long time due to heat and pressure.take an example of plastic. if we ** a plastic on any day and see it after a long time or few years then also we will get it back as in the conditon.
