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WorksheetsEarth's history
Total questions: 20
Worksheet time: 17mins
What is radio active decay?
The preserved remains of an organism.
Atoms in an unstable element break down to form another element.
When things die and their remains are buried.
The time it takes for 1/2 of the radioactive atoms to decay in an element.
If the same species of reptile was found in Africa and south america, what could this evidence support?
the used to be a land bridge between Africa and South America
That reptiles swam accross the ocean
Africa and South America used to be joined together
humans moved the reptiles from one continent to the other.
What is the best evdience this fossil could give you?
the environment the animal lived in
the size of the population
the mating habits of the species
the diet of the animal
To become fossilized an organism needs to be (2 answers)
a large body size
buried slowly
with hard parts
buried quickly
What was the major change between the Precambian eon and Phanerozoic eon?
life became more diverse
there was no life in the precambrian eon
There was an increase in volcanic eruptions
human fossils were found
What is absolute age?
comparing a rock layer to other rocks
a measure of the radioactive decay of isotopes
measuring the dimensions of a rock
comparing the rocks to the fossils in the area
First forms of life appeared in this era.
How is the geologic time scale divided?
major extinctions
major change in species
major change in geology
all of the above
