Geology Test III
8 Key Events: # 1 … Precambrian: The Birth of the Earth (4.6 Bya)
8 Key Events: # 2 … Precambrian: Oceans and Lands
8 Key Events: # 3 … Precambrian: Oldest Life 3.8 Bya
8 Key Events: # 4 … Precambrian: Earliest Animals 570 Mya
8 Key Events: # 5 … Paleozoic: The age of marine animals
8 Key Events: # 6 … Paleozoic: The biggest mass extinction 252 Mya
8 Key Events: # 7 … Mesozoic: The age of dinosaurs
8 Key Events: # 8 … Cenozoic: The age of mammals
Plates were already moving 3.5 billion years ago: True
Nearly ___ of all Earth’s history is Precambrian 90%
Why do we know less about our Earth’s history The rock record becomes incomplete and newer
the farther back in time we go? events erase older evidence
How long ago was the birth of the Earth? 4.6 Billion Years Ago
Shortly after its creation, Earth could be
Hot, barren, waterless, and rapidly rotating
described as:
Which of the following was NOT a characteristic
Presence of continents
of Earth shortly after accretion?
When is the estimated age of the Earth’s moon? 4.527 Bya
In which region is the Acasta Gneiss located? Northwest Territories of Canada
Which country is the Isua Greenstone Belt
Greenland
located in?
Precambrian shields are some of the oldest
True
crustal rocks
, What is the ratio of heat production 4 billion
3 to 6 times as great
years ago compared to now?
Heat production on Earth has generally: Decreased over time
What was the first step described in the origin of
Decreasing Heat
the oceans?
In the origins of the ocean, the ocean was NOT
True
salty
What was the second step described in the
Long Rain Period
origin of the oceans?
What was the third step described in the origin
Accumulation of Water
of the oceans?
What is the primary reason for why the sea Volatile chemicals released from Earth’s interior
became salty? and volcanoes
Approximately, how long ago did the oceans
4 billion years ago
form?
What are Acritarchs? The oldest known eukaryotic cells
What is considered to be the oldest eukaryotic
Grypania Spiralis
organism?
go on Pinterest and look up ideas for labels
ann w an e
under things like clock, window, door…..
What protects the Earth’s atmosphere from
The magnetic field
being blown away by solar wind?
When did our atmosphere begin to accumulate? After the magnetic field kicked in
Where did the atmospheric gasses in the Early
Volcanoes
Precambrian primarily originate from?
Why did the early atmosphere lack breathable
Free oxygen was not released by volcanoes
oxygen?
What is the most dominant non-variable gas in
Nitrogen
the Earth’s atmosphere today?
What as the most dominant non-variable gas in
Carbon Dioxide - CO2
the early Precambrian atmosphere?
8 Key Events: # 1 … Precambrian: The Birth of the Earth (4.6 Bya)
8 Key Events: # 2 … Precambrian: Oceans and Lands
8 Key Events: # 3 … Precambrian: Oldest Life 3.8 Bya
8 Key Events: # 4 … Precambrian: Earliest Animals 570 Mya
8 Key Events: # 5 … Paleozoic: The age of marine animals
8 Key Events: # 6 … Paleozoic: The biggest mass extinction 252 Mya
8 Key Events: # 7 … Mesozoic: The age of dinosaurs
8 Key Events: # 8 … Cenozoic: The age of mammals
Plates were already moving 3.5 billion years ago: True
Nearly ___ of all Earth’s history is Precambrian 90%
Why do we know less about our Earth’s history The rock record becomes incomplete and newer
the farther back in time we go? events erase older evidence
How long ago was the birth of the Earth? 4.6 Billion Years Ago
Shortly after its creation, Earth could be
Hot, barren, waterless, and rapidly rotating
described as:
Which of the following was NOT a characteristic
Presence of continents
of Earth shortly after accretion?
When is the estimated age of the Earth’s moon? 4.527 Bya
In which region is the Acasta Gneiss located? Northwest Territories of Canada
Which country is the Isua Greenstone Belt
Greenland
located in?
Precambrian shields are some of the oldest
True
crustal rocks
, What is the ratio of heat production 4 billion
3 to 6 times as great
years ago compared to now?
Heat production on Earth has generally: Decreased over time
What was the first step described in the origin of
Decreasing Heat
the oceans?
In the origins of the ocean, the ocean was NOT
True
salty
What was the second step described in the
Long Rain Period
origin of the oceans?
What was the third step described in the origin
Accumulation of Water
of the oceans?
What is the primary reason for why the sea Volatile chemicals released from Earth’s interior
became salty? and volcanoes
Approximately, how long ago did the oceans
4 billion years ago
form?
What are Acritarchs? The oldest known eukaryotic cells
What is considered to be the oldest eukaryotic
Grypania Spiralis
organism?
go on Pinterest and look up ideas for labels
ann w an e
under things like clock, window, door…..
What protects the Earth’s atmosphere from
The magnetic field
being blown away by solar wind?
When did our atmosphere begin to accumulate? After the magnetic field kicked in
Where did the atmospheric gasses in the Early
Volcanoes
Precambrian primarily originate from?
Why did the early atmosphere lack breathable
Free oxygen was not released by volcanoes
oxygen?
What is the most dominant non-variable gas in
Nitrogen
the Earth’s atmosphere today?
What as the most dominant non-variable gas in
Carbon Dioxide - CO2
the early Precambrian atmosphere?
