Sketch a rainbow. Show the correct positions of the primary and secondary bow and the proper order of colours in each. Where is the sun in your picture?
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Various protuberances, such as rocks, bushes, and ledges, made it easier for the climber to get up the wall.
In general, which of the statements below best describes what happens in terms of composition as crystallization proceeds down the Bowen's reaction series (shown in the figure)?
A) The early-formed silicates are enriched in iron and magnesium, resulting in such rocks as andesite and granite. As crystallization proceeds, the later-formed silicates are enriched in sodium, potassium, and silicon, resulting in and basalt. B) The early-formed carbonates are enriched in calcium and carbonate, resulting in such rocks as limestone. As crystallization proceeds, the later-formed carbonates are enriched in fossils, resulting in fossiliferous limestone and coquina. C) The early-formed silicates are enriched in iron and magnesium, resulting in such rocks as peridotite and basalt. As crystallization proceeds, the later-formed silicates are enriched in sodium, potassium, and silicon, resulting in andesite and granite. D) The early-formed silicates are enriched in sodium, potassium, and silicon, resulting in such rocks as peridotite and basalt. As crystallization proceeds, the later-formed silicates are enriched in iron and magnesium, resulting in andesite and granite.
Which site has the highest hazard for lava flows?
A. 1, the suburbs of Tacoma B. 2, a valley near the volcano C. 3, the flanks of the volcano D. 4, the summit of the volcano
Why must hydraulic fracturing or "hydrofracking" be used to extract natural gas from shale?
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