Which of the following forms different layers from season to season and can be used to determine how many years the layers represent?
A. varves
B. tree rings
C. layers in ice cores
D. All of these choices are correct.
Answer: D
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What is the source of most of the dissolved materials found in the ocean?
A) Outgassing B) Convection currents C) Dissolving and weathering of crustal rocks D) Biological activities
True north is a fixed geographic point
Indicate whether the statement is true or false
________ are tunnel-like caves within a lava flow.
A. Calderas B. Pores C. Lava tubes D. Vesicles E. Lava pipes
What was the purpose of the White Australia Policy?
A) to promote immigration of (white) North Americans and Europeans to Australia at the expense of non-white groups B) to promote the emigration of Australians who were of European descent to other nations in the South Pacific C) It was an ethnic isolationist policy established by the Australian government, which sought to place the country's entire aboriginal population on reservation-like holdings in the far western portion of the country. D) to encourage Australians of European descent to migrate from Australia's densely settled east coast to the more sparsely settled interior and west coast E) to clean up the country's white sand beaches, which had been seriously polluted by mining