EARTH: DAY 2 - ROCK AGES

Multiple Choice

The statement that the oldest layer will be at the bottom in an undisturbed sequence of rock layers is called the law of ....

• reversal
• displacement
• inversion
• superposition

Multiple Choice

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

• absolute age
• modern age
• prehistoric age
• relative age

Multiple Choice

The number of years that have passed since the rock formed is the rock's:

• absolute age

• relative age

• law of superposition

• index fossil

Multiple Choice

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

• quarter-life
• full-life
• decay-time
• half-life

Multiple Choice

How is radioactive dating used to determine the absolute age of rocks?

• The percent of radioactive parent isotopes remaining in the rock is compared to the amount of stable daughter isotopes that are present

• isotopes of different compounds are compared

• it compares the radioactive isotope in a younger layer of rock to an older layer

• daughter isotopes are compared to sister isotopes