Natural Disasters Exam 3

Terms in this set (85)

1) Changes in sea floor spreading rates; high
spreading rates can lead to more rock in the oceans,
causing flooding and creating inland seas.
2) Sea level changes; the presence or lack of
glacial ice on the planet can give a total swing of 210 m (690 feet) total difference
3) Numbers and sizes of continents; combined
landmasses will have lesser diversity of species (due to competition for food supply and living space) than
smaller, isolated landmasses.
4) Continental position and glaciation; plays a
role in climate change and have led to the more recent
Ice Age episodes.
5) Volcanic causes; flood basalts have been directly linked to mass
extinctions; flood basalts in oceans will lead to a sea level rise.
6) Changes in atmospheric and oceanic composition; volcanic eruptions emit massive amounts of gases, including greenhouse gases, which cause changes in atmospheric gas concentrations; sub-sea eruptions can alter ocean water acidity and oxygen concentrations
7) Climate change causes; volcanic eruptions emit huge volumes of gases, altering the heat balance and affecting global climate.
8) Ocean composition causes; if the oceans become too warm, they can become anoxic (no oxygen); salinity changes (up or down) will affect species
9) Extraterrestrial causes; an asteroid or comet impact can cause a hard, dark "winter" that can last for weeks to months, followed by years to decades of
an overly hot "summer."
10) Biologic causes; species go extinct every day, as their numbers drop to dangerous levels ("gambler's ruin"); epidemic (pandemic) disease