Quiz 2- Ch. 8/GeoTimeScale

Question 1

Geologic Time Scale

Answer 1

A worldwide history of geologic events that divides Earth’s history into intervals, many of which are marked by distinctive sets of fossils and bounded by times when those sets of fossils changed abruptly

Question 2

Eons

Answer 2

Hadean, Archean, Proterozoic, Phanerozoic (side)

Question 3

Eras

Answer 3

Paleozoic, Mesozoic, Cenozoic

Question 4

Periods

Answer 4

Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Permian, Triassic, Jurassic, Cretaceous, Paleogene, Neogene

Question 5

Where does oil and natural gas come from?

Answer 5

Oil and natural gas come from organic matter that was buried in sedimentary rock formations at some time in the geologic past

Question 6

Dating of petroleum rocks

Answer 6

provides clues as to where to look for oil and natural gas

Question 7

isotopic dating

Answer 7

The use of naturally occurring radioactive elements to determine the ages of rocks

Question 8

half-life

Answer 8

the time required for one half of the original parent atoms to be transformed into daughter atoms

Question 9

When is isotopic dating possible?

Answer 9

Only when a measurable number of parent and daughter atoms remain in the rock

Question 10

Precambrian period

Answer 10

covers 400 million yrs, 9/10 of Earth’s history

Question 11

Eon

Answer 11

largest division of geologic time, including eras