Debate1

Debate1 - Mass Extinction: o Rapid event o During which a...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Mass Extinction: o Rapid event o During which a significant part of life on earth becomes extinct o Life forms that become extinct must have belonged to different phyla, lived in different habitats, spread out all over the world Causes of Mass Extinctions: 1. Normal Disasters: hurricanes, volcanic eruptions, earthquakes o External Causes: so major and rapid that evolutionary adaptation and migration are impossible - Terrestrial: moving continents, globally low sea level, rapid change from cold climate as a result of large scale volcanism which leads to the emission of lots of CO2 to warmer climate, lack of oxygen - Extraterrestrial: large asteroids, comets, supernova explosions 5 Mass Extinctions and Proposed Causes: 1. End Ordovician: Sea level decreased, large glaciation possible from land plants taking up so much CO2 2. Late Denovia: Siljan crater, ash and dust kicked up by astronomical impacts or massive volcanism 3. End Permian: Bedout crater, volcanism, flood basalts/Siberia, one continent,
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Debate1 - Mass Extinction: o Rapid event o During which a...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online