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Name _____________________________
Date ___________________
Percents
Complete.

1.   A soil sample from the nearby power plant has 158 grams of sand in every kilogram of soil. What percent of the soil is made up of sand?

2.   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 21% of what is was 30 years ago. If an average of 2.2 million tons per year were removed 30 years ago, what is the current ore removal rate? Express your answer using scientific notation.

3.   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 243 m deep. It was well within the submarine's safe operating depth. In fact the submarine was capable of diving to a depth of 1,500 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.

4.   Soils with a lot of clay hold more water than soils that have less clay. Let's say you have two soil samples of equal mass (14 grams each) that are composed mostly of sand and clay. Sample one is found to be 18% water and sample two is found to be 13% water. If you had to make a choice, which one do you think had the most clay in it?

5.   In Bigtown Creek the flow of sediment is slowly decreasing as more and more of the drainage area around the creek is developed and covered by concrete. Ten years ago a measurement was made by the local university and an average mass of about 18 grams of sediment per hour was moving down the creek. Now the average sediment flow is only about 38% of that. What is the current mass sediment flow? Round your answer to the nearest tenth.

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