Final answer:
Under the hazardous substances clause in a mortgage, the lender can take action to protect their interests if the mortgagor uses any unusually dangerous substance on the property.
Step-by-step explanation:
Under the hazardous substances clause in a mortgage, if the mortgagor uses any unusually dangerous substance on the property, the lender can take action to protect their interests. This may include demanding that the substance be removed or imposing additional requirements on the borrower. For example, the lender may require the borrower to obtain liability insurance to cover any potential harm caused by the hazardous substance. Ultimately, the lender wants to ensure that their investment is protected and that the property remains in good condition.