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.
Cold Extermination: One of Greatest Mass Extinctions Was Due to an Ice Age and Not to Earth's Warming. 1  Mar. 6, 2017 â The Earth has known several mass extinctions over the course of its history. 2  Aug. 24, 2016 â Extreme global warming 252 million years ago caused a severe mass extinction of life on Earth.