0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
After precambrian time what are the two basic divisions of the geologic time scale?
Era & period Tracy Feng
What are two characteristics of precambrian rocks?
Nickel and Iron
What two gases probably dominated Precambrian Earths atmosphere?
i need help.
The Cenozoic era is called the age of?
The Age of Mammals is the other name for the Cenozoic Era. The Cenozoic Era lasted for 65 million years.
What is largest expanse of geologic time?
Precambrian Time extends from 4.6 billion years ago to 540million years ago. that's the greatest expanse of geologic time.
The two eras of the Precambrian period are?
Archeozoic and ProterozoicThe two periods of the Cenozoic Era are the Tertiary and the Quatemary.
After precambrian time what are the two basic divisions of the geologic time scale?
Era & period Tracy Feng
How long did the PreCambrian era last?
The Precambrian Era. The name means: "before the Cambrian period." This old, but still common term was originally used to refer to the whole period of earth's history before the formation of the oldest rocks with recognizable fossils in them. In the last few decades, however, geologists have found that there are some hard-to-discern fossils in some Precambrian rocks, so this period is now also known as the Cryptozoic or "obscure life" Eon (from the words "crypt" = "hidden," and "zoon" = "life"). The Precambrian covers almost 90% of the entire history of the Earth. It has been divided into three eras: the Hadean, the Archean and the Proterozoic. Source: Unknown The Precambrian Era comprises all of geologic time prior to 600 million years ago. The Precambrian was originally defined as the era that predated the emergence of life in the Cambrian Period. It is now known, however, that life on Earth began by the early Archean and that fossilized organisms became more and more abundant throughout Precambrian time. The two major subdivisions of the last part of the Precambrian are the Archean (oldest) and the Proterozoic. Rocks younger than 600 Ma are considered part of the Phanerozoic.
Was the mesozoic era during the precambrien era?
No. The Precambrian Era extended from 4.5 billion years ago to 542 million years ago. The Mesozoic Era lasted from 251 million years ago to 65 million years ago. The Paleozoic Era came in between the two.
Name two subdivisions of the dorsal cavity in humans?
The two subdivisions of the Dorsal Cavity are the Cranial Cavity and the Vertebral Cavity.
What are the two subdivisions of this group?
yea
What are two characteristics of precambrian rocks?
Nickel and Iron
What is the name given to the early continents?
The early continents are known as "cratons" or "proto-continents." These were the building blocks of the current continents and formed during the Precambrian era.
The peripheral nerbous system is divided into what two subdivisions?
What is spinal vertebrae called?
Spinal vertebra are called just that. There are subdivisions: cervical (neck), thoracic (chest), and lumbar (lower back). There are two sets that have fused in the adult: the sacrum and the coccyx (tail bones).
Autonomic and somatic refer to the two main subdivisions of what?
peripheral nervous system
What two gases probably dominated Precambrian Earths atmosphere?
i need help.
