science lab 4

the worksheet is attached

Complete the worksheet and return back on the worksheet

Analyzing Water Usage

‘Being green’ is commendable, but I hope that people don’t take too much pride and self-adoration because they shut off the water when they brushed their teeth. The truth of the matter is, conservation alone will do little to save our planet. Bigger steps need to be taken; and they need to be taken soon.

~ Naveen Jain

According to the United States Geological Survey (USGS), the government agency that oversees

United States
water supplies, the

United States
has abundant freshwater resources. However, many existing sources of groundwater and surface water, such as wells, lakes, and reservoirs, are in danger of being overused, and drought is a problem in some areas. The economic and environmental health of the country—and of the entire planet—depends, in part, on maintaining a balance between water demand and water supply.

In this exercise we will look into how has water usage changed in the

United States
since 1950? The primary objectives of the lab are to:

• Analyze changing trends in water usage over a 50-year period.

• Determine which categories use the most water per day.

• Discuss conservation methods that might decrease water use.

Materials: Calculator


1. Study the bar graph, based on data from the USGS. Look for patterns in water usage. Do certain categories consistently use more water than others? Have some categories increased their water use more quickly than others?

2. Create a data table based on the graph. Place the eleven time periods across the top of the table. List the five categories on the left side of the table. In the rows, write the total amount of water used per day by each category for the years listed.

3. Calculate the total amount of water used per day by all categories for each year. Add this information to the data table.

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