Eras and periods
Fossils
Earths layers
Scientists
Earths formation
100
this is a part of earths history
What is a era
100
This is the remains of a plant or animal that lived long ago
What is fossil
100
This is the number of layers the earth has
What is 4
100
this person came up with the theory of Continental drift.
What is Alfred wegener
100
This was the state of matter the earth was in when it was first forming.
What is liquid
200
This era is the longest
What is Precambrian
200
These are the types of rock that contain fossils
What is sedimentary rock
200
This is the thickest layer
What is the mantle
200
This person came up with the theory earth was cooling slowly.
What is Lord Kelvin
200
This is how mountains are formed
What is plate tectonics
300
This era is the shortest.
What is crutatios era
300
The study of fossils
What is paleontology
300
This is the third layer from the crust
What is outer core
300
This team of scientists found the tombstone layer/found how the dinosaurs became extinct.
What is Alverez
300
This is how earth got water
What is meateors
400
This era has seven periods
What is Paleozoic
400
A fossil of an organism that lived in many places around the world for a short period of time.
What is index fossil
400
This is the thickness of the continental crust.
What is 20 to 30 miles
400
This scientist came up with the theory of the ice age
What is Louis Agassiz
400
This organism is how the earth got air.
What is Stromatolites
500
This period is The first to contain plant life
What is Cambrian
500
This is what its called when a whole animal gets trapped in sap and the sap hardens.
What is Amber
500
This type of earth crust is Three to six miles thick
What is oceanic crust
500
This scientist found the earths core.
What is Inge Lehmann
500
This cycle was very important to the earth forming.
What is the rock cycle
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