Geology Test III
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34 Terms
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 farther back in time we go?
The rock record becomes incomplete and newer 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 described as:
Hot, barren, waterless, and rapidly rotating
Which of the following was NOT a characteristic of Earth shortly after accretion?
Presence of continents
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 located in?
Greenland
Precambrian shields are some of the oldest crustal rocks
True
What is the ratio of heat production 4 billion years ago compared to now?
3 to 6 times as great
Heat production on Earth has generally:
Decreased over time
What was the first step described in the origin of the oceans?
Decreasing Heat
In the origins of the ocean, the ocean was NOT salty
True
What was the second step described in the origin of the oceans?
Long Rain Period
What was the third step described in the origin of the oceans?
Accumulation of Water
What is the primary reason for why the sea became salty?
Volatile chemicals released from Earth’s interior and volcanoes
Approximately, how long ago did the oceans form?
4 billion years ago
What are Acritarchs?
The oldest known eukaryotic cells
What is considered to be the oldest eukaryotic organism?
Grypania Spiralis
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