ch 17 Flashcards
study of geological
stratigraphy
term for layer of sedimentary rock laid down at a particular time
strata
term for rocks formed from cooling and hardening molten material
igneous rocks
term for the time on earth before life evolved
hadeon
term for gradual movements of continents that have occurred over billions of years
continental drift
term for movement of one plate under another where oceanic and continental plates converge
subduction
term for a period of evolutionary history during which rates of extinction are higher than during intervening times
mass extinctions
term for assemblage of all organisms of all kinds living at particular time/place
biota
term for rapid diversification of multicellular life that took place during cambrian period
cambrian explosion
term for all animals living at particular time/place
fauna
what are the 4 eons
hadean, archean, proterozoic, phanerozoic
the rapid diversification of multicellular organisms occurred in the ___ eon.
phanerozoic
in undisturbed sedimentary rock, strata from the______ are immediately above rocks from the Ordovician
Silurian
which process or event is not considered a plausible hypothesis for the causes of mass extinctions
competition between organisms
statement about oxygen
it made aerobic metabolism possible
which group of organisms has been most affected by periods of increased glaciation at different times in earth’s history
marine life
continental drift
continents move because rising magma exerts pressure on the plates that float on top of it.
during the end of the Permian____ period, the O2 concentration decreased significantly and resulted in____
Permian, mass exctintion
best analogy for describing continental drift
sliding tiles on a number puzzle
