q.4. which of the following time divisions makes up about 88% of earths history?
a) precambrian time
b) paleozoic era
c) mesozoic era
d) cenozoic era
q.5. which of the following statements is correct?
a) it is estimated that earth formed approximately 4.6 billion years ago.
b) the geologic time scale outlines earths life forms and geologic history.
c) the phanerozoic eon is subdivided into 3 eras the paleozoic, mesozoic, and cenozoic.
d) all of the above are correct.
q.6. what is the broadest interval of the geologic time scale?
a) period
b) epoch
c) eon
d) era
q.7. what is the name of the unit of geologic time that is longer than an epoch but shorter than an era?
a) period
b) column
c) eon
d) age
q.8. which of the following is known as the age of dinosaurs?
a) precambrian time
b) paleozoic era
c) mesozoic era
d) cenozoic era
q.9. which of the following is known as the age of mammals?
a) precambrian time
b) paleozoic era
c) mesozoic era
d) cenozoic era
q.10. the term __________ means \ancient life\.
a) mesozoic
b) paleozoic
c) cenozoic
d) cambrian
q.11. the __________ era is known as the era of recent life
a) mesozoic
b) paleozoic
c) cenozoic
d) cambrian
q.12. which of the following is the oldest period in the paleozoic era?
a) cambrian
b) ordovician
c) silurian
d) devonian
q.13. which of the following is the oldest period in the mesozoic era?
a) silurian
b) triassic
c) jurassic
d) cretaceous

Question

Accepted Answer

### Q.4
# Brief Explanations:
Precambrian Time spans from Earth's formation (about 4.6 billion years ago) to the start of the Paleozoic Era (about 541 million years ago). It makes up about 88% of Earth's history. The other eras (Paleozoic, Mesozoic, Cenozoic) are much shorter in comparison.
# Answer:
a) Precambrian Time

### Q.5
# Brief Explanations:
- Option a: Earth's formation is estimated to be around 4.6 billion years ago.
- Option b: The Geologic Time Scale does outline Earth's life forms and geologic history by dividing time into eons, eras, periods, etc.
- Option c: The Phanerozoic Eon is indeed subdivided into the Paleozoic, Mesozoic, and Cenozoic Eras. So all statements are correct.
# Answer:
d) All of the above are correct

### Q.6
# Brief Explanations:
The geologic time scale has intervals from broadest to narrowest: Eon > Era > Period > Epoch > Age. So Eon is the broadest interval.
# Answer:
c) Eon

### Q.7
# Brief Explanations:
The order of geologic time units (from longer to shorter) is Eon > Era > Period > Epoch > Age. So a Period is longer than an Epoch but shorter than an Era.
# Answer:
a) Period

### Q.8
# Brief Explanations:
The Mesozoic Era is known as the "age of dinosaurs" because dinosaurs were the dominant land animals during this era (Triassic, Jurassic, Cretaceous periods). Precambrian had early life, Paleozoic had early complex life, and Cenozoic is the "age of mammals".
# Answer:
c) Mesozoic Era

### Q.9
# Brief Explanations:
The Cenozoic Era is known as the "age of mammals" because mammals became the dominant land animals after the extinction of dinosaurs at the end of the Mesozoic. Precambrian and Paleozoic predate mammal dominance, and Mesozoic was dinosaur-dominated.
# Answer:
d) Cenozoic Era

### Q.10
# Brief Explanations:
- Paleozoic: "Paleo" means ancient, "zoic" means life, so it means "ancient life".
- Mesozoic means "middle life", Cenozoic means "recent life", and Cambrian is a period in the Paleozoic.
# Answer:
b) Paleozoic

### Q.11
# Brief Explanations:
Cenozoic means "recent life" (from "Ceno" meaning recent and "zoic" meaning life). Mesozoic is "middle life", Paleozoic is "ancient life", and Cambrian is a period in Paleozoic. So the Cenozoic Era is the era of recent life.
# Answer:
c) Cenozoic

### Q.12
# Brief Explanations:
In the Paleozoic Era, the periods in order from oldest to youngest are Cambrian, Ordovician, Silurian, Devonian, etc. So Cambrian is the oldest period in the Paleozoic Era.
# Answer:
a) Cambrian

### Q.13
# Brief Explanations:
In the Mesozoic Era, the periods in order from oldest to youngest are Triassic, Jurassic, Cretaceous. So Triassic is the oldest period in the Mesozoic Era. Silurian is a Paleozoic period.
# Answer:
b) Triassic

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Q.4

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