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