Conditions on the early earth surface are thought to include _______ ultraviolet and _______ carbon dioxide than today.
Fill in the blank(s) with the appropriate word(s).
Answer: higher, higher
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Mantle plumes do not move with continental plates
Indicate whether the statement is true or false
Wegener used which of the following to provide evidence for continental drift?
A) Earthquake distribution B) Magnetic pole reversals C) Locations of active volcanoes D) Seafloor magnetic patterns E) Shape of continental margins
The major factors in glacial periods lasting tens of millions of years appear to be ________.
A. an increase in volcanic activity and excess amount of methane in the atmosphere B. a long-term cooling of the Sun and extended periods of maximum axial tilt C. having one or more large continental masses near the poles and oceanic circulation that is more longitudinal (north-south) than latitudinal (east-west) D. having one or more large continental masses near the equator and extended periods of minimum axial tilt of Earth E. minimum rates of coral and limestone formation and the existence of a supercontinent
The magnetic field of the earth is most likely generated in the:
a. lithosphere b. asthenosphere c. mantle d. core