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Biology Lecture, Ch 25 vocab
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Fossils
the preserved remains of ancient organisms
they can tell a great deal about body forms of organisms that lived long ago
sedimentary rock
rocks formed by the accumulation of grains on the bottom of bodies of water
if undisturbed, the oldest layer (strata) lies at the bottom while the newer at the top
strata
a layer of sedimentary rock
Half-life
a successive time interval in which half the remaining radioactive material of the radioisotope decays and becomes a different more stable isotope
paleomagnetic dating
a method that relates the ages of rocks to patterns of Earth's magnetism (this changes over time)
rocks preserve magnetic fields
plate techtonics
the study of the movement of major land masses
continental drift
the movement of lithospheric plates and the continents they contain
mass extinction
caused by changing physical parameters
when a large proportion of a species that are living at the time disappear.
biota
an assemblage of all organisms of all kinds living at a particular time or place
Flora
all the plants living at a particular time or place
Fauna
all of the animals living at a particular time or place
Precambrian
3 billion years ago
shallow seas became populated with life
life = microscopic prokaryotes (eukaryotes evolved 1/2 way through
Cambrian explosion
a rapid diversification of life
happened before cambrian period
amnioties
vertebrates with well protected eggs that can be laid in dry places
resulted from split of the terrestrial vertebrate lineage
Pangea
A supercontinent created from all the continents that exists today being connected.
Laurasia
Pangea divided into 2 and created this and Gondwana
This was the northern half
Gondwana
the other half that resulted from Pangea splitting into 2
this is the southern half
Author
kickenbugg
ID
68777
Card Set
Biology Lecture, Ch 25 vocab
Description
Ch 25 "A history of Life on Earth"
Updated
2011-02-25T01:33:13Z
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