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The Precambrian Era Flashcards | StudBud
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The Precambrian Era
The Precambrian Era
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Earth Science
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Questions
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Answers
1
Why do we know so little about the Precambrian Era?
Erosion, subduction, and metamorphsis of rocks has occurred
There was no life to study
The Earth was too new
There was no oxygen
2
What continent has the best preserved precambrian shields?
Australia
Canada
South America
Asia
3
Prokaryotes and Eukaryotes are both _________.
single-celled organisms
multi-celled organisms
double-celled organisms
animals
4
The crust cooled and hardened, forming_____.
The continents
The mountains
The states
The countries
5
In geology, shields are__________________.
Buried deep in the crust
Large surface areas of Precambrian rocks
Used for fighting
Small lakes
6
In a process called _____Cyanobacteria make their food using light energy.
food-o-synthesis
photosynthesis
chemosynthesis
cellosynthesis
7
Cyanobacteria left behind mounds of calcium carbonate called ___________.
holes
stalagmites
burrows
stromatolites
8
The earliest life most likely began _________.
In the skies
On the land
In the oceans
On the sun
9
Dense elements like ___ and ___ formed the Earth's core
Iron and Nickel
Hydrogen and Helium
Lead and Sulfur
Aluminum and Iron
10
Which was not a major event of the Precambrian Era?
Continents form
Formation of Earth
Atmosphere and Oceans form
Humans form
11
Iron Ore deposits in the rock record signify what?
Oxygen in the atmosphere
Chemical Reactions
Rust
Iron in the atmosphere
12
What gas was removed from the atmosphere when the oceans began to form?
Carbon Dioxide
Oxygen
Fluorine
Nitrogen
