Briefly explain why the movement of continents over geologic time was the best explanation for polar
wandering. What will be an ideal response?
Since the Earth has only one magnetic north pole now, it is extremely unlikely that there would have
been more than one in the past, but this would have been required to explain the different polar wander
paths of the different continents. The only other possible explanation is that the continents were once
joined and have since moved.
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Underlying magnetism are electrons that
A. spin on their axes. B. revolve around the nucleus. C. both of these D. neither of these
Biomes are
a. large aquatic regions of the earth with distinct climate and certain species adapted to them b. large terrestrial regions of the earth with distinct climate and certain species adapted to them c. groups of populations living in harmony in a given ecosystem d. all the biological portions of the planet e. types of forests that are extensive and widespread on a continent
the most widespread oxides are those that combine oxygen and ______.
a - native elements b - silver c - calcite d - iron e - water
What was the first line of evidence that the Cretaceous Mass Extinctions were caused predominantly
by a large meteorite impact? What will be an ideal response?