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What do the periods the geologic time scale represent?
Usually, they represent periods between extinction events, where a particular type of lifeform was dominant.
What marks the end of a geologic period?
Each era on the scale is separated from the next by a major event or change. Different spans of time on the time scale are usually delimited by major geological or paleontological events, such as mass extinctions.
Why are some units of geologic time scale longer and some shorter?
Because its whenever something drastic happens, or a dominant animal dies off and new ones come in.
What is the largest division of time on geologic time scale?
Eon
How are chunks of time in the geologic timeline organized?
The Geologic Time Scale is broken up into several periods of time, during which there were great changes in the biodiversity on Earth. We can see distinct changes in the flora (plants) and fauna (animals of each time period. The age range of each period is determined by radiometric dating.
What unit of geologic time followed the mass extinction of dinosaurs?
Jurassic period
What were the major geologic events in Jurassic time period?
The existence and extinction of the dinosaurs.
Is the Jurassic period a geologic time that followed the mass extinction of dinosaurs?
No. The Jurassic was in the middle of the dinosaurs' reign on Earth. The time period after the extinction of the dinosaurs is referred to as the Paleogene or the Tertiary.
Why is the geologic time scale used to show the Earth's history?
because the time span of earth past is so great geologic
What do the periods the geologic time scale represent?
Usually, they represent periods between extinction events, where a particular type of lifeform was dominant.
What ended the permian period?
The Permian Period was ended by the Permian/Triassic Extinction Event, which wiped out 90% of the species on Earth at that time.
What event ended the paleozoic and mesozoic era?
Extinction did.
What marks the end of a geologic period?
Each era on the scale is separated from the next by a major event or change. Different spans of time on the time scale are usually delimited by major geological or paleontological events, such as mass extinctions.
What do the relative geologic time and absolute geologic time combine to form?
The geologic time scale.
Why are some units of geologic time scale longer and some shorter?
Because its whenever something drastic happens, or a dominant animal dies off and new ones come in.
Diffrenciate geologic time with geologic column?
Geologic column is an ordered arrangement of rock layers that is based on the relative age of the rocks. Geologic time is the time IN the geologic column.
What is the largest division of time on geologic time scale?
Eon
