Pros: 1  Works equally well in open terrain, under cover or in a gym. 2  Accurate on flat or hilly terrain and when making quick, sharp turns (e.g., when trail running or on an indoor track). 3  Lightweight design is sleeker than most GPS-enabled SDMs.
Definitions for mass extinction. Here are all the possible meanings and translations of the word mass extinction. Wiktionary(0.00 / 0 votes)Rate this definition: mass extinction(Noun) A sharp decrease in the total number of species in a relatively short period of time.
A mass extinction is a large-scale event when many different plant and animal species become extinct. The last extinction occurred approximately 65.5 million years ago, but there have been at least five major mass extinctions when more than 50 percent of animal species disappeared.Think of 50 percent of todayâs plant and animal speciesâhalf of the worldâs biodiversityâdisappearing.he last extinction occurred approximately 65.5 million years ago, but there have been at least five major mass extinctions when more than 50 percent of animal species disappeared. Think of 50 percent of todayâs plant and animal speciesâhalf of the worldâs biodiversityâdisappearing.