GLG 201 2.21.07 - GLG 201 2.21.07 Mass Extinction Possible...

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

View Full Document Right Arrow Icon
GLG 201 2.21.07 Mass Extinction Possible causes? Your Ideas! Meteors impact earth and throw up dust in atmosphere, blocks out sun’s rays and cools earth; volcanism, same as above, lots of ash; Climate change: meteor, volcano, change in oxygen percentage (35% down to 21%), and periods of glaciation Possible causes 1. Global Climate Change 2. Mountain Building and volcanism 3. Asteroid impact 4. Predators, disease, and competitors 5. Likely a COMBINATION of these things Global Climate Change Earth’s temperature is lower or higher in past Ice ages/warming repeat over and over again The period when climate changes is critical Some organisms are susceptible to small temp changes Cold-blooded organisms Tropical species Mountain Building and Volcanism Changes is habitat Produces changes in elevation on land Increase in basalt in ocean basins Raises sea level Long periods of felsic volcanism Ash in atmosphere Lowers temperature Asteroid and meteor impact Send lots of dust into atmosphere Earth Cools
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 / 3

GLG 201 2.21.07 - GLG 201 2.21.07 Mass Extinction Possible...

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