The 3 geological eras since Precambrian super-eon :-
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.
existed since the planet cooled
Since the begining of time.
The Earths core is defiantly slowing down but by how much? The Earths rotation speed has slowed by 2 milliseconds since 1820
It is not possible to name them, as there were many over generations since early Greek 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 ]
The Clock of eras is a graphic aid to help us visualize geologic time. It uses the analogy of a circular clock to represent the development of our planet in geologic time. One can see at a glance the relative time lengths of each major geologic era. The Clock represents geologic time on the Earth since its birth to the present, from the initial events that brought about the formation up to now. Each hour represents approximately 375 million years
a few.
since dinosaurs
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 continents have moved, Volcanoes and mountains have made hige changes in the earths suface too.
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.
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.
since the earths been here
it has increased vision since its out of earths atmosphere
40%
No, since they're metamorphic they come from millions of years of very specific geologic events.