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Exam 2: Internal Structure of Earth and Plate Tectonics

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Question 41

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The Earth's magnetic field is generated by

A) convection of hot iron-rich fluid around a solid core.
B) convection of magma in the Earth's mantle.
C) the natural rotation of the Earth.
D) gamma radiation emitted from the Sun.
E) the iron-rich magnetic core.

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Question 42

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Describe the theory of continental drift and explain how it relates to plate tectonics.

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Question 43

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The Earth remains a constant size due to the balance of plate destruction in subduction zones and production of new lithosphere at spreading ridges.

Where would you find ridge push?

During subduction,one plate sinks under another tectonic plate.

Describe the balance between the birth and destruction of crust on the seafloor.

Subduction zones commonly feature submarine trenches which have some of the deepest ocean waters,reaching several kilometres in depth.

Mount St.Helens is a volcano associated with which type of lithospheric plate boundary?

Iron-bearing minerals in volcanic rocks formed at spreading ridges can align with the Earth's magnetic field.

Volcanic activity can result from hotspot activity and divergent plate boundaries.Explain where and how the magma for each of these volcanoes comes from and how it rises to the surface.In this explanation,briefly describe the layers of the Earth and how convection is a mechanism for plate tectonics.

The youngest seafloor rocks are found

Describe how the Hawaiian Islands were formed and explain how they are evidence for plate motion.