The ____ _____ _______is one of Africa's most spectacular physical features, with broad steep walled trough extending from the Zambezi Valley northward to the Red Sea and the valley of the Jordan River.
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Question 2Canada has the world's largest reserves of __________ __________, mineral deposits in which a thick liquid petroleum is mixed with sand and clay.
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Question 3A ___________ species is one that affects many other organisms in an ecosystem.
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Question 4The __________ __________ gave migrants 160 acres ofland within the western half of U.S.to live and farm provided they occupied the land for at least five years.
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Question 5_______ (the destruction of the resilience and the biological potential of arid and semiarid ecosystems) is an unnatural and human-induced change that has been quite common in the Sahel region for the last several decades.
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Question 6Early exploration of North America was devoted to finding a warm water route called the __________ __________ that would expedite shipping between Europe and Asia.
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