Hydroelectric power provides 15 percent of the total commercial energy production in the United States
Indicate whether the statement is true or false.
Answer: FALSE
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Downstream floods typically cover larger areas than do upstream floods
Indicate whether the statement is true or false
What is a technique used to estimate past temperatures on Earth recorded in very old ice layers?
a. Ice coring b. Oxygen-isotope analysis c. CaCO3 analysis d. Radioactive decay
Recognizing, preventing and controlling landslides is prohibitively expensive and so is rarely done. Indicate whether the statement is true or false
By 2010, the __________ made up more than three quarters of the United States' economy, as measured by its share of the Gross Domestic Product (GDP).
-quaternary sector -no single economic sector holds such away in the US economy -primary sector -tertiary sector -secondary sector