| Fossils | Rock Ages | Geologic Time Scale | Rock Ages 2 | Geologic Time Scale 2 |
| 10 | 10 | 10 | 10 | 10 |
| 20 | 20 | 20 | 20 | 20 |
| 30 | 30 | 30 | 30 | 30 |
| 40 | 40 | 40 | 40 | 40 |
| 50 | 50 | 50 | 50 | 50 |
| Final Question | ||||
The earliest fossils are of
The earliest fossils are of
One-celled organisms
A fossil is an object that contains traces, remains, or evidence of
A fossil is an object that contains traces, remains, or evidence of
Living things from long ago
Fossil formation in rocks is able to take place
Fossil formation in rocks is able to take place
Only when conditions are just right
Why don't igneous rocks contain fossils?
Why don't igneous rocks contain fossils?
The high temperature of the molten rock from which igneous rock forms destroys any trace of plants or animals
The soft parts of an organism often decay very quickly. The result is that many fossils
The soft parts of an organism often decay very quickly. The result is that many fossils
Only preserve traces of the hard parts of an organism
Over a period of 704 million years, one-half of the uranium 235 atoms in a rock sample were broken down into another form of the atom, lead 207. The ____________ of uranium 235 is 704 million years.
Over a period of 704 million years, one-half of the uranium 235 atoms in a rock sample were broken down into another form of the atom, lead 207. The ____________ of uranium 235 is 704 million years.
Half-Life
____________ can be used with igneous rocks to determine their age in years.
____________ can be used with igneous rocks to determine their age in years.
Radioactive Dating
By studying the carbon 14 levels of the original remains of a saber-toothed cat, scientists have determined that the ____________ of this cat is 20,000 years old.
By studying the carbon 14 levels of the original remains of a saber-toothed cat, scientists have determined that the ____________ of this cat is 20,000 years old.
Absolute Age
Between 206 and 144 million years ago, Nerinea trinodosa was a common sea animal that lived in many different places on Earth. Its fossilized remains are now used as ____________.
Between 206 and 144 million years ago, Nerinea trinodosa was a common sea animal that lived in many different places on Earth. Its fossilized remains are now used as ____________.
Index Fossil
The age of an event or object in relation to other events or objects is called ____________.
The age of an event or object in relation to other events or objects is called ____________.
Relative Age
True/False: Hutton's theory of uniformitarianism states that Earth is an always-changing place and that the same forces of change at work today were at work in the past.
True/False: Hutton's theory of uniformitarianism states that Earth is an always-changing place and that the same forces of change at work today were at work in the past.
True
True/False: Changes on Earth are always gradual.
True/False: Changes on Earth are always gradual.
False; Some changes on Earth are gradual, but other changes are fast.
True/False: Humans have existed for most of Earth's history.
True/False: Humans have existed for most of Earth's history.
False; For most of Earth's history, humans did not exist.
True/False: The geologic time scale divides Earth's history into intervals of time defined by major events or changes on Earth.
True/False: The geologic time scale divides Earth's history into intervals of time defined by major events or changes on Earth.
True
True/False: Throughout Earth's history, the number and type of life forms has remained fairly constant.
True/False: Throughout Earth's history, the number and type of life forms has remained fairly constant.
False; During Earth's history, life has developed and changed over time from simple one-celled forms to more complex organisms.
How do scientists know what dinosaurs looked like?
How do scientists know what dinosaurs looked like?
They examine fossils for clues.
Rock fossils form
Rock fossils form
Most frequently in sedimentary rock
Igneous rock that cuts through sedimentary layers is always
Igneous rock that cuts through sedimentary layers is always
Younger than the layers of sediment it cuts through
By studying layers of sedimentary rock, scientists can determine the
By studying layers of sedimentary rock, scientists can determine the
relative ages of the layers
The oldest layer in an undisturbed sedimentary bed is usually
The oldest layer in an undisturbed sedimentary bed is usually
On the bottom
Which statement best describes how Earth changes over time?
Which statement best describes how Earth changes over time?
Earth is constantly changing.
The rate of the breakdown of radioactive material is measured in
The rate of the breakdown of radioactive material is measured in
Half-lives
Humans first appeared
Humans first appeared
During the age of mammals
Precambrian time consists of the
Precambrian time consists of the
First 4 billion years of Earth's history
The first evidence of life on Earth can be traced back to about
The first evidence of life on Earth can be traced back to about
3.8 billion years ago
The smallest unit of geologic time is expressed as a(n)
The smallest unit of geologic time is expressed as a(n)
epoch
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