How did the cephalopods of the Cenozoic seas differ from the cephalopods of the Mesozoic? What will be an ideal response?
During the Mesozoic Era, the ammonites and belemnites proliferated and were a major
constituent of the marine invertebrate community. After the extinction of the ammonites and
belemnites, many of the cephalopods of the Cenozoic were shell-less forms, such as squids and
octopuses. The nautiloids are closely related to the ammonites, but survived the extinction event
and are still found in the marine environment.
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The United States does not allow foreign companies or countries to buy agricultural land
Indicate whether this statement is true or false.
The most stable layer, in terms of temperature and density, is the mixed layer
a. True b. False
What type of fault caused the canal damage shown in the following photograph (photo courtesy USGS)? 
A. Reverse fault B. Strike-slip C. Normal fault
The Earths system that includes the oceans, rivers, lakes, and glaciers of the world is called the ______.
What will be an ideal response?