Answer to Question 1ANS: C
Magnetite is in the mantle. When new crust is formed, the magnetite is in that crust. As it cools, it
points in the direction of the current magnetic field of the Earth. This allowed scientists to determine
the direction of magnetic fields throughout history. Information can be found in the section The
Confirmation of Plate Tectonics
Answer to Question 2ANS: C
The asthenosphere remains pliable due to the internal heat of the Earth. This heat is thought to travel
through the Earth's interior via conduction. The lithosphere is able to remain in motion because of that
pliability. Information can be found in the section A New Understanding of Earth Evolved Slowly.
6-8 Earth’s Major Tectonic Plates
The Interiors of Earth and Mercury
The geomagnetic polarity time scale shows how Earth’s magnetic pole has changed through geologic tim
These illustrations show Ellen Craft, a slave with and without a disguise. She dressed “as a disting
Earth Atmosphere
Earth 340 Million Years Ago