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Crater Lake holds the title of deepest lake in the United States. It is located in Oregon and is the centerpiece of Crater Lake National Park.


Crater Lake from above

The Lake’s Formation

Crater Lake did not begin as a lake. It was once an enormous volcano. Over a period of 400,000 years, a series of volcanoes formed in the Cascade Mountain Range in the western United States. Mount Mazama was located in present-day Oregon. Approximately 6,000 to 8,000 years ago, Mount Mazama erupted and caused the volcano to collapse. It left behind a caldera, a large bowl-shaped depression in the earth.


Two land platforms later formed when smaller volcanic eruptions took place after the caldera already began filling with water. These platforms were named Wizard Island and Merriam Cone. A smaller island dubbed Phantom Ship can also be seen jutting out of the water.


Over time, the caldera cooled. Each year, as rain and snow fell in the region, the caldera filled. When the snow melted in the spring and summer, the water levels in the caldera rose. Water collected in the depression over 250 years to create a lake. Soon, the lake was surrounded by lush pine trees, wildflowers, and lichens. Natives living in the area named the lake Blue Lake and later, Lake Majesty. In 1853 the first non-native person, John Wesley Hillman, came upon the lake. He christened it Crater Lake.


Crater Lake Today

Today, Crater Lake is a U.S. National Park. Crater Lake’s claims to fame are its significant depth and its astoundingly clear water. Due to its protection by the National Park Service, Crater Lake will likely remain as pristine and lovely in the years to come as it is today.

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Questions
Why is a chronological structure a good choice for this text?


The author is able to include their opinion of Crater Lake.


The author can explain, in order, how Crater Lake formed over time.


The author can describe a time when they visited Crater Lake.


The author can offer solutions to the problems that occur today at Crater Lake

Answer 1

The correct answer is:
The author can explain, in order, how Crater Lake formed over time.

Reason: The text describes events that happened across time (volcanic activity, collapse, later eruptions forming islands, rain and snow filling the caldera), so a chronological structure lets the writer present those events in the sequence they occurred.