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The 3 geological eras since Precambrian super-eon :-
- Paleozoic Era (542 - 251 Ma)
- Mesozoic Era (251 - 65.5 Ma)
- Cenozoic Era (65.5 Ma - Now)
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∙ 14y ago
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Why hasn't cyanobacteria evolved much since the Precambrian Era?
There are many different types of cyanobacteria. We are just now beginning to discover how many exist in a drop of seawater. We have no idea how many existed in the Precambrian era.
The earths magnetic shield has?
existed since the planet cooled
How long have water ice and wind effected the erosion of earths surface?
Since the begining of time.
When will the earth's core cool down?
The Earths core is defiantly slowing down but by how much? The Earths rotation speed has slowed by 2 milliseconds since 1820
Who were Artemis follower's?
It is not possible to name them, as there were many over generations since early Greek history.
Which era spans the greatest number of years in earths geological history?
The pre-Cambrian period which is a little over 630 million years ago. Before this era, there were no biota which leave a decent fossil impression - mainly soft-bodied forms. But see Ediacara in Wikipedia for more information.The earth by comparison is about 4.5 billion years since formation in roughly its present form. [So 630/4.5 000 ]
Which parts of North America have NOT been added to the continent since the Precambrian?
a few.
On which geologic time epoch did bees exist?
since dinosaurs
Why hasn't cyanobacteria evolved much since the Precambrian Era?
There are many different types of cyanobacteria. We are just now beginning to discover how many exist in a drop of seawater. We have no idea how many existed in the Precambrian era.
How is the geologic used in relative dating?
The geologic column is the result of the core sample showing layers of artifacts and material. Since some of these can be carbon dated, a relative time period can be established.
How has earths surface changed since the beginning of earths time?
The continents have moved, Volcanoes and mountains have made hige changes in the earths suface too.
How has the earths surface changed since the beginning of earths time?
The continents have moved, Volcanoes and mountains have made hige changes in the earths suface too.
How is The geologic column using relative dating?
The geologic column is the result of the core sample showing layers of artifacts and material. Since some of these can be carbon dated, a relative time period can be established.
Explain how the reversal of earths magnetic poles can be produce a calendar for part of earths history?
In rock formed when the sea floor is being built, such as at the mid-Atlantic ridge, the minerals preserve the magnetic polarity. Since the flipping of the poles is fairly regular, the count of the bands can give a time.
When did algae live on earth?
since the earths been here
What are the advantages of using a spectroscope?
it has increased vision since its out of earths atmosphere
What percentage of the earths forests have been lost to deforestation since 1950?
40%
