Geologic Time

Changes in rock layers show evidence of what 2 things?

• Organisms that lived at different times

• The weather on a daily basis

• Types of envrionments

• How many people lived during that time

What is the oldest rock layer?

• A

• C

• E

• G

Using a diagram to determine which rock layers are oldest and youngest is referred to as _.

• Absolute Dating

• Relative Dating

• Ordering

• Scaling

What is the age of Earth?

Scientists have sufficient evidence to suggest that we are currently in our 6th mass extinction due _ and _

• Acid rain

• Humans

• Climate Change

• Aliens

Radioactive substance is known as a

• Fossil

• Carbon-14

• Isotope

• Gold

This can be used to measure decay or organic material

• Carbon-14

• Fossil

• Strata

• Nitrogen-55

1 half-life is

• 25%

• 40%

• 80%

• 50%

2 half-lives is

• 25%

• 40%

• 80%

• 50%

Radioactive substances can be used to measure the age of a

• Fossil

• Bridge

• Organism

• Volcano