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.
Kirk Janowiak, Eclectic, educated, and loves to teach. Views. There is only one cause for mass extinctions and that is a major or equally massive change in the environment a large scale. Any wide-scale event or series of events that can alter the regional or global climate and/or environment over a large area can, thus, trigger a mass extinction. Such events might include: