8th - Earth Changes Test

What method is used to determine the fixed or absolute age of rocks?

• Ages of key fossils

• Comparing to nearby layers

• Magnetic patterns in the mid-ocean ranges

• Radiometric dating

Which principle states that in undisturbed rock layers, the oldest rocks are at the bottom and the youngest rocks are at the top?

• Continental Drift theory

• Paleontologists and fossils

• Principle of superposition

• Magma oozes up through rifts

What do geologists look for to determine the relative age of rocks?

• Changes to the rocks

• Radiometric dating

• Fossils in the rocks

• All of the above

What theory explains the movement of Earth's continents over time?

• Sea-floor spreading

• Magnetic patterns in the mid-ocean ranges

• Continental Drift theory

• Radiometric dating

What process involves the spreading apart of rifts and the oozing up of magma through them?

• Paleontologists and fossils

• Magma oozes up through rifts

• Continental Drift theory

• Comparing to nearby layers

When did Pangaea begin to break up?

• About 18 million years ago

• About 1800 years ago

• About 180 billion years ago

• 180 million years ago

What is the name of the supercontinent that existed millions of years ago?

• Pangaea

• Rodinia

• Gondwana

• Laurasia

What is the term for the process of magma oozing up through rifts and spreading them apart?

• Magma oozes up through rifts

• Sea-floor spreading

• Continental Drift theory

• Comparing to nearby layers

What do paleontologists study to understand the history of Earth?

• Radiometric dating

• Changes to the rocks

• Fossils in the rocks

• All of the above

What do geologists look for to determine the order of rock layers?

• Radiometric dating

• Fossils in the rocks

• Changes to the rocks

• All of the above