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What eon are we currently in?
the bottom of the scale
eon, era, period, epoch
phanerozoic
precambrian
true
extinction
major changes in life
mass extinction
When 50% or more of species on Earth go extinct in a short period of time.
the bottom of the scale
eon, era, period, epoch
phanerozoic
precambrian
true
extinction
major changes in life
mass extinction
Good can come from mass extinctions even though organisms are wiped out.
the bottom of the scale
eon, era, period, epoch
phanerozoic
precambrian
true
extinction
major changes in life
mass extinction
What determines when a period starts or ends on the geologic timescale?
the bottom of the scale
eon, era, period, epoch
phanerozoic
precambrian
true
extinction
major changes in life
mass extinction
When reading a geologic time scale, which area on the scale represents the oldest time in history?
the bottom of the scale
eon, era, period, epoch
phanerozoic
precambrian
true
extinction
major changes in life
mass extinction
Which of the following has the categories of the time scale in order from largest to smallest?
the bottom of the scale
eon, era, period, epoch
phanerozoic
precambrian
true
extinction
major changes in life
mass extinction
Most of Earth's history occurred in what eon?
the bottom of the scale
eon, era, period, epoch
phanerozoic
precambrian
true
extinction
major changes in life
mass extinction
A species completely wiped out is a(n)
the bottom of the scale
eon, era, period, epoch
phanerozoic
precambrian
true
extinction
major changes in life
mass extinction
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