What is our current eon ______________, era _______________, and period _______________ Age boundary between the Hadean eon and Archean eon __________________ Age boundary between Archean eon and Proterozoic eon __________________
Earth’s history is divided into unequal time intervals. The boundaries between the intervals mark significant geological (very early Earth) or evolutionary events on Earth’s history. Example: The boundary between the Precambrian eon and the Phanerozoic eon is marked by the rapid evolution and diversification of organisms with hard body parts.
The time intervals are eons, which are subdivided into eras. The eras are subdivided into periods. The periods are further subdivided into epochs (not shown on figure).
- What is our current eon ______________, era _______________, and period _______________
- Age boundary between the Hadean eon and Archean eon __________________
- Age boundary between Archean eon and Proterozoic eon __________________
- Age boundary between Proterozoic eon and Phanerozoic eon ________________
- Age boundary between Paleozoic era and Mesozoic era ____________________
- Age boundary between Mesozoic era and Cenozoic era ____________________
- What is the longest eon? _________________
- Duration of that eon ________________
- What percentage of Earth’s history is covered by that eon?
% = (Duration of Eon / Age of Earth) X 100
% = (_____________ / 4.65 billion) X 100
% = _____________
- What is the shortest eon? ___________________
- Duration of that eon ________________
- What percentage of Earth’s history is covered by that eon?
% = (Duration of Eon / Age of Earth) X 100
% = (_____________ / 4.65 billion) X 100
% = _____________
- What is the longest era? _________________
- Duration of that era ________________
- What percentage of Earth’s history is covered by that era?
% = (Duration of Era / Age of Earth) X 100
% = (_____________ / 4.65 billion) X 100
% = _____________
- What is the shortest era? ___________________
- Duration of that era ________________
- What percentage of Earth’s history is covered by that era?
% = (Duration of Era / Age of Earth) X 100
% = (_____________ / 4.65 billion) X 100
% = _____________
- What is the longest period? _________________
- Duration of that period ________________
- What percentage of Earth’s history is covered by that period?
% = (Duration of period / Age of Earth) X 100
% = (_____________ / 4.65 billion) X 100
% = _____________
- What is the shortest period? _________________
- Duration of that period ________________
- What percentage of Earth’s history is covered by that period?
% = (Duration of period / Age of Earth) X 100
% = (_____________ / 4.65 billion) X 100
% = _____________
- The suffix “zoic” is Greek for “life.” Which two eons do not have that suffix as part of their name?
- _______________
- _______________
- What does the absence of the suffix suggests regarding life during those two eons? ________________________________________________
- Notice the Figure does not subdivide the Hadean eon into eras (like the other eons). Taking into account the age of the eon, what will be the most likely reason for not doing era subdivisions? _______________________________________
- The Phanerozoic eon is the eon of complex life (at least in terms that life moved from microscopic to macroscopic and involved the rapid evolution and diversification of organisms with hard body parts).
- For how long has “complex” life existed on Earth? _________________
- How long did it take for it to first appear (Assume Earth’s age is 4.65 billion years)? _________________
- The first evidence of life on Earth (a chemical signature of life) dates back to about 4 billion years. How long did it take for life to first appear on Earth (assume Earth’s age is 4.65 billion years)? ______________
- As we explore our neighboring planets, would it make sense to use the current Geologic Time Scale to explain/describe their geologic history? Why or why not?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
