Which of the following statements with reference to L-Wave or Long Wave generated by an earthquake is/are correct ? 1. They follow the Earth's circumference 2. They travel at more or less at a constant rate Select the answer using the code given below :

Statement 1 is correct: L-waves (Long waves or Surface waves) are confined to the Earth's surface and propagate along its circumference. They cover the longest distance among seismic waves and can circle the globe multiple times after a large earthquake.

Statement 2 is correct: Unlike body waves (P and S waves), which travel through the Earth's interior and experience significant changes in velocity (acceleration and refraction) as they pass through layers of varying density (crust, mantle, core), L-waves travel through the surface crust. While they are scientifically dispersive (speed varies with wavelength), in a general geographic context, they are described as traveling at a "more or less constant rate" because they do not traverse the deep, density-stratified layers that cause drastic speed variations in body waves.