The repayment of principal from scheduled mortgage payments that exceed the interest due. The scheduled payment is the payment the borrower is obliged to make under the note. The scheduled payment less the interest equals amortization. The loan balance declines by the amount of the amortization, plus the amount of any extra payment. If such payment is less than the interest due, the balance rises, which is negative amortization. The Fully Amortizing Payment: The monthly mortgage payment that will pay off the loan at term is called the fully amortizing payment. On an FRM, the fully amortizing payment is calculated at the outset and does not change over the life of the loan.
Natural products. Natural products are small molecules produced naturally by any organism including primary and secondary metabolites. They include very small molecules, such as urea, and complex structures, such as Taxol.
A natural resource is anything that people can use which comes from nature. People do not make natural resources, but gather them from the earth. Examples of natural resources are air, water, wood, oil, wind energy, iron, and coal. Refined oil and hydro-electric energy are not natural resources because people make them.