Forests are found only under conditions where annual moisture balance is positive
a. True
b. False
Indicate whether the statement is true or false
True
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Earth's crust moves because
A. the continental crust floats on the oceanic crust. B. the mantle is below the crust. C. the mantle is very hot and flows from internal convection. D. part of the mantle is hot enough to flow as a plastic solid.
A finely crystalline or glassy igneous texture indicates that
A. there was a lot of gas in the magma. B. the rock cooled slowly. C. the rock cooled quickly. D. the rock broke apart as it flowed. E. the ash and pumice were hot and became compacted.
During the Mesozoic, climatic variation on Earth could be described as ____
A)extreme in terms of precipitation B)extreme in terms of temperature C)lacking great north-south variation D)having great north-south variation E)similar to the present day
The high price of food on the global market is closely related to
A) the increased use of fertilizers and the rising cost of fossil fuels to produce them. B) the increased use of biological control and other sustainable agricultural methods. C) the cost to construct and use modern forms of irrigation. D) the cost of remediation to restore degraded soils to usable conditions.