To determine the Absolute age of rocks scientist use
To determine the Absolute age of rocks scientist use
What is Radioactive Dating?
Most fossils form when organism die and are buried in
Most fossils form when organism die and are buried in
What is sediment?
Index Fossils are useful because they can tell what type of age of the rock
Index Fossils are useful because they can tell what type of age of the rock
What is Relative age?
Plants and animals first reached land during this Era
Plants and animals first reached land during this Era
What is the Paleozoic Era?
When a mineral REPLACES all or parts of an organism it is called a
When a mineral REPLACES all or parts of an organism it is called a
What is a Petrified Fossil?
This radioactive material is used to date rocks that lived up to about 50,000 years ago
This radioactive material is used to date rocks that lived up to about 50,000 years ago
What is Carbon-14?
A great number of different organisms evolved during this event
A great number of different organisms evolved during this event
What is the Cambrian Explosion?
Magma that forces its way into rocks and hardens is called an
Magma that forces its way into rocks and hardens is called an
What is an Intrusion?
This era is often called the Age of the Reptile
This era is often called the Age of the Reptile
What is the Mesozoic Era?
Pangaea formed at the END of what era?
Pangaea formed at the END of what era?
What is the Paleozoic Era?
The process by which all the different kinds of living things have changed over long periods of time is called
The process by which all the different kinds of living things have changed over long periods of time is called
What is Evolution?
Fossils are almost always found in what kind of rock?
Fossils are almost always found in what kind of rock?
What is Sedimentary Rock?
This law states that in horizontal layers of sedimentary rock the oldest rock is on the bottom
This law states that in horizontal layers of sedimentary rock the oldest rock is on the bottom
What is the Law of Superposition?
The earliest form of life appeared during
The earliest form of life appeared during
What is the Precambrian time?
Radioactive dating is used for this type of rock
Radioactive dating is used for this type of rock
What are Igneous rocks?
An animal with a backbone is called a
An animal with a backbone is called a
What are vertebrates?
On the geologice time scale, eras are divided into
On the geologice time scale, eras are divided into
What are periods?
Reptiles evolved from
Reptiles evolved from
What are Amphibians?
The time for half of the radioactive atoms to decay in a radioactive element
The time for half of the radioactive atoms to decay in a radioactive element
What is the Half-Life?
Humans first appeared at the END of what Era?
Humans first appeared at the END of what Era?
What is the Cenozoic Era?
The law of superposition is use to determine what type of age for rocks
The law of superposition is use to determine what type of age for rocks
What is Relative age?
This event occurred at the end of the Cretaceous period
This event occurred at the end of the Cretaceous period
What is a mass extinction?
A scientist who studies fossils is called an
A scientist who studies fossils is called an
What is a Paleontologist?
Animals without backbones are called
Animals without backbones are called
What are Invertebrates?
Dinosaurs ruled the Earth during what Era?
Dinosaurs ruled the Earth during what Era?
What is the Mesozoic Era?
This results when a rock layer is eroded away and a new layer forms on top of that
This results when a rock layer is eroded away and a new layer forms on top of that
What is an Unconformity?
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