This is the standard definition version of the Small Raindrop animation MPEG.
SMALL RAINDROP ANIMATION - When a small raindrop falls on the ocean, it produces sound underwater by its impact on the ocean surface and, more importantly, by sound created from a bubble trapped underwater during its splash. Different raindrop sizes produce distinctive sounds. When recorded underwater, small raindrops make a sound like a hiss. The following animation is first simulated as a real-time small raindrop, and then slowed down to demonstrate the distinct sound of impact and the subsequent ring of the higher frequency sound made by the bubble.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 22.214.171.124.0