For example, if a buyer obtains a seven-year balloon mortgage to purchase a home, he has seven years of equal monthly payments at a fixed interest rate. This rate is often lower than what the buyer would otherwise be able to secure under a traditional mortgage loan.
When sound reflects off a special curved surface called a parabola, it will bounce out in a straight line no matter where it originally hits. Many stages are designed as parabolas so the sound will go directly into the audience, instead of bouncing around on stage.
Surface waves are larger in amplitude and longer in duration than body waves. These waves arrive at seismograph after the arrival of P-and S-waves because of their slower velocities. The two different surface waves are: Rayleigh waves or descriptively called ground roll in exploration seismology.