Unit 5 Review (Earth & Space Science)

What two methods are used for determine the age of rocks and fossils?

• Relative & Absolute Dating

• Absolute & Resolute Dating

• Carbon & Water Dating

• Relative & Absent Dating

Which is true about relative dating?

• Relative dating uses the half-life of isotopes to get the exact age of a rock or mineral.

• Carbon-14 dating is used on rocks and minerals that are relatively young.

• Potassium-Argon dating is used on very old rocks and minerals.

• The law of superposition is used to determine a rock's relative age.

What is half-life?

• The length an organism lived in prehistoric times.

• The time it takes for the radioactivity of a specific isotope to fall to half its original value.

• Half the life of an organism.

• The time it takes for a geologist to determine the age of a rock or mineral.

This includes the remains of organic material and are used in dating rocks or layers.

• Fossils

• Half-life

• Rule of Superposition

• Relative Age

Which of the following is known as the "age o the dinosaurs?"

• Mesozoic

• Cenozoic

• Archean

• Hadean

During this time, the Earth was cooling, rocks and crust were formed, and oxygen formed.

• Mesozoic

• Cenozoic

• Archean

• Hadean

If a student used the analogy of her stacking books in her locker, which law of relative dating is she referring to?

• Law of Superposition

• Law of Crosscutting

• Law of Inclusions

• Law of Inertia

Which statement is INCORRECT about the geologic time scale?

• Life was not present when the Earth was still cooling.

• Prokaryotes showed up on Earth long before reptiles and small plants.

• Modern humans arrived later than reptiles and small plants.

• Dinosaurs showed up just after the Earth was created.

Geologists use two main ways to find the age of rocks. When they want an age in actual years, they find the _____ which involves looking at the radioactive decay of specific isotopes.

• absolute age

• relative age

• half-life

• rule of superposition

The rate of decay is called the ____ of the isotope, or the time it takes for half of the isotope to decay to a daughter product.

• absolute age

• relative age

• half-life

• rule of superposition