Why do transform faults form? a. They form due to remnants of ...

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Why do transform faults form?
  a. They form due to remnants of convergent boundaries.
  b. They form as results of secondary seismic waves.
  c. They form due to lithospheric plate subduction zones.
  d. They form because the axis of seafloor spreading across the surface of the Earth cannot
  follow a straight line smoothly.

Question 2

A(n) ____ is a very large column of superheated mantle that originates at the boundary of the core and
  mantle.
  a. Volcano
  b. Plume
  c. Asthenosphere
  d. Ridge

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Answer to Question 1

ANS: D
The spreading of the Earth at diverging boundaries cannot follow a straight line smoothly. It breaks
and fractures along the way which creates transform faults. Information can be found in the section
Plates Interact at Plate Boundaries.

Answer to Question 2

ANS: B
A mantle plume is a large column of superheated mantle. The largest of these plumes are known as
superplumes. There is a superplume that lifts all of Africa. These are mediums for heat from the core
and are thought to resupply the asthenosphere. Information can be found in the section The
Confirmation of Plate Tectonics.

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