Which of the following statements about soil management is true?
A) Only about 10% of the world's food comes from land-based agriculture.
B) Soil degradation is a problem unique to the past two centuries.
C) More than 25% of cultivated land was degraded as of 2013.
D) The Mayan Empire serves as a model for excellent soil management.
C
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Basin configuration can cause variations in tidal ranges. Indicate whether the statement is true or false
What effect does a large volcanic eruptions typically have on the atmosphere?
A) warming for several years B) cooling for one or two years C) cooling for several decades D) increases in CFCs
A sand ridge connecting an island to the mainland or to another island is a ________
A) sea stack B) jetty C) breakwater D) tombolo