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What is an atom?
The basic unit of matter.
What are isotopes?
Atoms of the same element with different numbers of neutrons.
What is radiometric dating?
A technique that uses isotopes
What is a fossil?
Preserved remains or traces of ancient organisms.
What are the major stages of Earth's history?
Eons, Eras, Periods
How do fossils help us understand Earth's history?
They provide evidence of past life
Define Dendrochronology
The study of tree rings to date events and environmental changes.
If only 25% of carbon-14 remains, how many years old is the bone? (Carbon-14 half-life: 5730 years)
11,460
What is the name of the unit we are about to start?
Diversity of life
What is the principle of superposition?
The idea that lower rock layers are older than upper layers.
What is absolute dating?
A method that gives the exact age of a rock.
What is relative dating?
Ordering geological events without knowing their exact age.
How do we know which rock layer is older?
By the principle of superposition (the lower layer is older).
How old is the Earth?
Approximately 4.5 billion years.
Absolute or relative? The first book was published in IV a.c.
Absolute
Absolute or Relative? Daniel is older than Paula
Relative
