WorksheetsEarth's Early History (ch 20.3)
Total questions: 15
Worksheet time: 11mins
Denser materials formed the Earth's core while less dense materials formed the ______.
Core
Mantle
Surface
Atmosphere
The theory suggests that Earth cooled enough for water, composed of hydrogen and oxygen, to remain a ___ about _____ years ago.
liquid and 4 billion
solid and 2 billion
gas and 4 billion
liquid and 2 billion
gas and 2 billion
The Miller & Urey experiment is an example of a scientific attempt to prove how ____ appeared
first plants
first organic molecules
first eukaryotic cells
first prokaryotic cells
Which of the following was a key component in the Miller & Urey experiment to simulate early Earth conditions providing energy for the molecules to combine
Solar Panels
Electrical Current
Magnetic Field
High Pressure
What was the significance of the amino acids found in the Miller & Urey experiment?
They indicated the presence of life
They showed the possibility of life forming from non-living materials
They were used as fuel
They were a byproduct of combustion
The earth and life began during the ___
Paleozoic Era
Mesozoic Era
Cenozoic Era
Precambrian
The first living cells are believed to be __
anerobic bacteria living in a methane - ammonia environment
aerobic bacteria living in a nitrogen - oxygen environment
anerobic protists living in a methane - ammonia environment
aerobic protist living in a nitrogen - oxygen environment
The first living cells are believed to be formed ___ although scientists are not sure how.
3.5 million years ago
2 billion years ago
4.6 billion years ago
3.5 billion years ago
What do scientists believed converted the atmosphere from methane - ammonia to the nitrogen - oxygen atmosphere we enjoy today.
photosynthesis performed by plants and algae
photosynthesis performed by bacteria
earth cooling enough for water to remain in liquid form
endosymbiosis
primordial soup theory
The formation of the first eukaryotic cells is called ___
photosynthesis performed by bacteria
earth cooling enough for water to remain in liquid form
endosymbiosis
primordial soup theory
Put the following events in the correct order
formation of the earth
water cooling and forming into surface water
first organic molecules
first prokaryotic cells
oxygen based atmospher
The earth is believed to have formed when
cosmic debris collided
water cooled into liquid form
tectonic plates collided
endosymbiosis
Earth's early atmosphere from mainly a collection of ___
methane, ammonia, carbon monoxide and sulfur dioxide
carbon dioxide
oxygen and nitrogen
Put the following Eras of time in order (from earliest to today)
Precambrian
Paleozoic
Mesozoic
Cenozoic
Using the Geologic Time Scale, put the following terms in order (from largest to smallest)
Eon
Era
Period
Epoch
