Water Unit Math Review Problems


Solve the following math problems. This assignment will be graded for accuracy. Please show all work and all units to get full credit. DO NOT COPY from one another. Copied work will result in no credit.

Coral reefs are a biodiversity hotspot for marine environments. Large numbers of different species of fish congregate in these areas. This has made them hot spots for fishing, and thus overfishing.

1) Coral area on Earth is around 600,000 km2. The average depth of coral reefs is 15 m. What is the volume of coral on Earth? (express in km3 and m3)

2) Coral is made up primarily of calcium carbonate (CaCO
3). The average density of CaCO3 in coral is 2000 kg of CaCO3/1 m3of coral. Compute the amount of CaCO3 in all the coral on Earth, expressed in kg and g.

3) A recent study predicted that as the ocean becomes more acidic, the amount of coral will decrease by 15%. Compute the amount of CaCO
3 in kg that will be lost from the global coral sink if this decrease occurs.


4)  The Mississippi Watershed is the 4th largest watershed in the world. The area of the land that water drains from in the watershed is 3,000,000 km2, which covers area from 32 states and 2 Canadian provinces. The average precipitation the watershed receives in the year is 800 mm. Calculate the volume of runoff that goes through the watershed in the year in m3, km3 and L. [1 m3 = 1000 L]

Only 25% of the total runoff from the Mississippi Watershed ends up running off and emptying into the Gulf of Mexico. Calculate the number of L of water that will dump into the Gulf of Mexico for the year.

6)  There are about 30,000,000 seconds in a year. Calculate the number of liters that enter the Gulf of Mexico per second. 

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