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Paleomagnetism Definition and Study

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Questions and Answers

What is the main focus of paleomagnetism?

Exploring the chemical composition of minerals

Evaluating the strength and direction of the Earth's magnetic field in rocks (correct)

Studying the remains of ancient organisms

Analyzing the temperature of Earth's core

Why do certain rocks like basalt exhibit stronger remnant magnetism?

Because they form at lower temperatures

Due to their high density compared to other rocks

Because of their higher quantities of magnetite (correct)

Due to their higher quantities of quartz

How are paleomagnetic data useful in understanding Earth's history?

By observing the color variations in rock formations

By analyzing the density of different rock types

By decoding the magnetic signal preserved in rocks (correct)

By studying the growth patterns of minerals

What important geological phenomenon is associated with the polarity reversals recorded in rocks?

Plate tectonics theory Signup and view all the answers

What is the lithosphere made up of according to the text?

Crustal and upper mantle material Signup and view all the answers

What theory was the plate tectonic theory derived from?

Continental drift theory Signup and view all the answers

How did Alfred Wegener suggest the continents could 'drift' apart?

By plowing through the oceanic plate material Signup and view all the answers

What technique do scientists use to track the movements of continents throughout geologic history?

Paleomagnetism Signup and view all the answers

What process creates new crust at mid-ocean ridges?

Seafloor spreading Signup and view all the answers

What are hot spots on Earth's surface associated with?

Mantle plumes Signup and view all the answers

What is the main characteristic of a mantle plume?

It is an area of the mantle where magma is hotter than the surrounding material. Signup and view all the answers

How do hot spots differ from other volcanos?

Hot spots are usually found within the center of plates. Signup and view all the answers

Why do volcanoes become extinct as they move away from hot spots?

They no longer receive heat from the mantle plume. Signup and view all the answers

How do hot spots contribute to proving the validity of plate tectonics?

By creating chains of volcanoes that indicate plate motion. Signup and view all the answers

What information do scientists derive from the age of volcanoes located over hot spots?

The motion of the overriding plate. Signup and view all the answers