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Time, fossils, tectonic plates

Across
Tectonic plates are pieces of this layer
Sea floor spreading is when plates drift ______
The amount of time it takes for half of a radioactive sample to decay into a stable form
Tectonic plates float on this layer.
The first eon of the earth when there was no life of any kind
The era when plants and animals first appeared on land
A method of determining the age of an object by comparing the amount of a radioactive parent isotope to the stable daughter isotope
Wegener thought that the continents had once been joined together because he found matching _______ on the coasts of certain continents.
The longest periods of geologic time
An atom that has the same number of protons as other atoms of its kind, but a different number of neutrons, possibly making it unstable
The era that's called the age of the reptiles
The entire geological column is found in this layer of the earth.
Earthquakes produce these waves
Down
Who first proposed the idea of Pangaia?
A scientist who studies fossils
The molten rock that comes up from the mantle
A scientist who studies rocks
The dense center of the earth
Relative dating is when paleontologists ________ the age of one thing with the age of something else.
The name of the supercontinent that existed 245 million years ago
The fossil of an organism which is known to have lived during a particular time in geologic history. These fossils are useful in determining the age of a rock sample.
The era in which we live
A piece of an era
A convergent boundary is where plates come ________