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* This is a pre-made sheet.
Use the link at the top of the page for a printable page. |
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The old mine near Smallville used to produce a lot of silver ore. The ore deposit has been pretty much depleted now though. Today the ore removal is only about 28% of what is was 30 years ago. If an average of 2.5 million tons per year were removed 30 years ago, what is the current ore removal rate? Express your answer using scientific notation.
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In a dry riverbed near the town of Turkey, the gravel is fossiliferous. In fact 2% of every rock found in the bed is a whole or part of a fossil marine organism. If you collected 440 rocks from the bed, about how many of them would you expect to be fossils?
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A geyser (Big Bill they call it) in Thermal Park erupts a column of water 24 feet high every 16 minutes. Another geyser in the park (called Mighty Joe) erupts a column 79 feet high every 22 minutes. The eruption cycle of Mighty Joe is what percent longer than that of Big Bill? Round your answer to the nearest hundredth of a percent.
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Z-Globe sent a submarine to the bottom of the Pacific Ocean off the coast of California. Its mission was to collect some rocks for radiometric dating. It was in a fairly shallow place and the water was only 207 m deep. It was well within the submarine's safe operating depth. In fact the submarine was capable of diving to a depth of 1,900 m. At what percent of the safe operating depth was the sub operating during its mission off the coast of California? Round your answer to the nearest tenth of a percent.
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A soil sample from Mr. Bloop's farm was sent to the county agriculture department for analysis. It was found to consist of 20% sand, 24.4% silt, 31.8% clay, 7% gravel and the rest was humus. What percent of the sample was humus?
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