During Phase 4 of migration to the United States (1920-1970), where did the majority of immigrants come from?
A) England and Africa
B) Ireland and Germany
C) Southern and Eastern Europe
D) Canada and Latin America
E) Latin America and Asia
E) Latin America and Asia
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As shown in the Discussion Starter of this chapter, 26% of the 9.6 quadrillion Btu of renewable energy in 2014 came from hydroelectric plants. How much coal is saved (not consumed) because of the hydroelectric plants? Assume coal has an average energy content of 10,000 Btu per pound and a coal-fired power plant has an efficiency of 36% and a 6% loss in the transmission lines.
What will be an ideal response?
The use of strip cropping helps to control soil erosion by
A) increasing the cation exchange capacity. B) increasing saltation. C) reducing leaching. D) reducing runoff.
List the 3 major population clusterson Earth.
From a chemical standpoint, the three reacting agents of greatest importance to weathering are ________
A) hydrogen, oxygen, and nitrogen B) oxygen, nitrogen, and carbon dioxide C) carbon dioxide, oxygen, and water D) water vapor, nitrogen, and carbon dioxide E) argon, aluminum, and calcium