Why Is It Called The KT Extinction? The event receives its name from the German word Kreide Why is it called the K-T boundary? The abbreviation for the boundary between the Cretaceous and Tertiary periods is the K-T boundary, where K is the abbreviation for the German form of the word Cretaceous. This boundary corresponds
What Caused The 5 Mass Extinctions? Earth’s changing temperature. ocean acidification. oxygen levels. volcanism. glacial cycles. sea level rise. meteorite impacts. ocean circulation. What caused the mass extinctions? Past mass extinctions were caused by extreme temperature changes, rising or falling sea levels and catastrophic, one-off events like a huge volcano erupting or an asteroid hitting