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Crash course.

In "It Came From Space" (p. 14), you read about what scientists are learning from meteorites, or asteroids that fall to Earth. Sometimes when a large meteorite hits the ground, the impact creates a crater. The chart below lists several large craters found in the United States. Complete the chart by converting the diameters from miles to kilometers. We did the first one for you. (Hint: 1 mile = 1.61 kilometers.) Then use the information to make a bar graph and answer the questions that follow.

GRAPH IT

Create a bar graph to show the diameter of each crater in kilometers. Be sure to give your graph a descriptive title and label the x- and y-axes.

ANALYZE IT

1. In the list above, which state has the largest crater? The smallest crater?

2. Which crater has a diameter of 3.8 kilometers? Where is this crater located?

3. Where is the crater that is twice the diameter of Glover Bluff located?

4. Measuring 90 km (55.9 mi) in diameter, the Chesapeake Bay crater in Virginia is the largest crater in the United States, but none of it is exposed--it's buried under 300 meters (1,000 feet) of sand, silt, and clay. Many other craters on Earth are also not visible to the naked eye. Why do you think that is?

A Selection of Craters in the United States

                            Diameter      Diameter
Crater Name     Location    (miles)    (kilorrmeters)

Ames            Oklahoma       10           16.1
Barringer        Arizona      0.73
Beaverhead       Montana     37.28
Crooked Creek   Missouri      4.35
Flynn Creek     Tennessee     2.36
Glover Bluff    Wisconsin     4.97
Kentland         Indiana      8.08
Manson            Iowa       21.75
Marquez           Texas       7.89
Serpent Mound     Ohio        4.97
Upheaval Dome     Utah        6.21

SOURCE: PLANETARY AND SPACE SCIENCE CENTRE,
UNIVERSITY OF NEW BRUNSWICK

ANSWER

A Selection of Craters in the United States

Ames                 16.1
Barringer             1.18
Beaverhead           60
Crooked Creek         7
Flynn Creek           8
Glover Bluff         13
Kentland             35
Manson               12.7
Serpent Mound         8
Upheaval Dome        10

Location

Analyze It

1. Montana has the largest crater and Arizona has the smallest crater.

2. Flynn Creek crater in Tennessee has a diameter of 3.8 kilometers.

3. Ames crater in Oklahoma has twice the diameter of Glover Bluff
crater.

4. Answers will vary but should include: Some craters are not visible
because they are covered by water and soil like the Chesapeake Bay
crater. Others may be covered with ice or may have eroded away.

Note: Table made from bar graph.
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Title Annotation:CRITICAL-THINKING SKILLS; craters
Publication:Science World
Geographic Code:1USA
Date:Mar 5, 2011
Words:416
Previous Article:Out of this world.
Next Article:Goodbye, voyager!
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