review

Relative age dating is used to determine the...

• actual age of an event
• length of time between two events
• age of one event in comparison with other events
• rate at which a gologic process occurs

The age of a rock compared to the ages of other rocks is the rock's

• absolute age
• geologic age
• sedimentary age
• relative age

Which is the most accurate form of absolute dating?

• radiometric dating
• erosion rate
• deposition rate
• index fossils

The time it takes for half of a radioactive isotopes to decay into stable isotopes is called the

• isotope decay
• radiometric dating
• half life
• absolute age

Using radiometric dating, scientists have established the age of Earth to be about 4.6 billion years old. This is an example of an absolute age because the age in years has been calculated.

• True

• False

The half-life of a radioactive substance is the amount of time it takes for _____ of the parent atom to decay.

• 1/4

• 1/2

• 3/4

• all

What can scientists use to study how Earth's climate and atmosphere have changed over time?

• Ice cores

• Index fossils

• Law of Superposition

• Radioactive dating

How do scientists obtain ice cores?

• They drill them out of the ground of cold areas

• They freeze water samples collected from warm areas

• They freeze water samples that they create using carbon injection

• They just find them

What part of ice cores tells us what the atmosphere was like in the past?

• The water when the ice cores melt

• Each thin layer of ice

• The air bubbles trapped in ice cores

• The rings of the ice core

If a layer of volcanic ash is found in an ice core, what does that indicate?

• Ash borer beetles lived in that habitat.

• A volcanic eruption occurred.