To carry a large amount of oil, tankers are designed to be quite large. The *Exxon Valdez* was considered a midsized oil tanker measuring 967 feet long and 166 feet wide. In comparison, the largest tanker in the world, the *Jahre Viking*, formally known as the *Seawise Giant*, is 1504 feet long and 226 feet wide. These vessels are so large that crew members often use bicycles to travel from one point to another on the ship.

By measuring an average size oil tanker, such as the *Exxon Valdez*, students will have a much better understanding of how large a typical oil tanker is. In addition, the students will be asked to sketch a scale drawing of a typical oil tanker.

### Get a sense of the size of an oil tanker

- Ask students to share any knowledge they have about oil spills in the news.
- Discuss the length of a medium-sized tanker like the
*Exxon Valdez*. - Measure the size of the
*Exxon Valdez*outside your school and mark its size on the pavement to show to other students. Ask students to brainstorm various possible measuring strategies. - Using a tape measure, mark off a 50-foot or 100-foot piece of string or rope. Students simply lay the string down, making sure to accurately mark and record the number of times they step and repeat. As an example, using a 100-foot length, it would be necessary to step and repeat 10 times to lay out the distance of 1,000 feet.
- Students can also measure the distance of their average stride. As an example, the stride of an adult is close to 3 feet. Knowing this, it is easy to estimate distances by counting the number of strides needed to cover a certain distance and multiply the number of strides by three (3 feet per stride). Allow students the opportunity to determine their stride and then check for accuracy with a predetermined distance.
- With the outside work complete, distribute a piece of graph paper (8 1/2" x 11") to students and ask them to determine the scale which would allow for the
*Exxon Valdez*to be sketched on the graph paper. An appropriate scale, assuming that you are using 1/4" grid paper, would be to have each square equal 25 feet. See if the students can determine the scale for themselves first.

### The Oil Tanker Run

The largest oil tanker in the world, the *Jahre Viking*, is 1504 feet long. Assuming you could run a mile in four minutes, how long would it take you to run from one end of the* Jahre Viking* to the other end? (5,280 feet/mile)

The 50-yard dash is a popular event in school track and field events. How many 50-yard dashes, placed end to end, would be needed to represent the entire length of the *Jahre Viking*?

### Materials

- pencils
- paper
- graph paper
- rulers
- tape measures
- string
- chalk