What term applies to all of geologic time prior to the Phanerozoic eon? Why is this span not divided into as many smaller units as the Phanerozoic eon?
What will be an ideal response?
Precambrian refers to time before the Phanerozoic. Precambrian history is not known in great detail. The quantity of information geologists have deciphered about Earth's past is somewhat analogous to the detail of human history. The farther back we go, the less we know. Certainly, more data and information exist about the past 10 years than for the first decade of the twentieth century; the events of the nineteenth century have been documented much better than the events of the first century A.D. and so on. So it is with Earth history. The more recent past has the freshest, least disturbed, and most observable record. The farther back in time the geologist goes, the more fragmented the record and clues become.
You might also like to view...
Organisms that lack a rigid internal skeleton for the attachment of muscles but may posses a hard, protective outer covering are ________
a. invertebrates b. vertebrates c. fishes d. plankton
Which of the following religions are most closely related to Judaism?
A) Christianity and Islam B) Hinduism and Sikhism C) Shinto and Buddhism D) Animism and Zoroastrianism E) Taoism and Confucianism
The physical geography of parts of New Mexico and West Texas, including Big Bend National Park are an extension of what?
A) The Great Plains B) The Gulf Coastal Plain C) The Rocky Mountains D) The Intermontane
Why are karst landscapes largely missing surface drainage?
A. Water is consumed by vegetation. B. They are located in arid regions. C. Water is used up in dissolution. D. They are located in polar regions. E. Water flows in underground channels.