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What formed Crater Lake?
Mount Mazama
Crater Lake was formed by the fall of a volcano. Mount Mazama, a 12,000-foot-tall volcano, erupted and collapsed approximately 7,700 years ago, forming Crater Lake. Mount Mazama was an important symbol to the native Makalak people who lived in the surrounding areas.
What geologic feature is Crater Lake?
caldera
Crater Lake partially fills a type of volcanic depression called a caldera that formed by the collapse of a 3,700 m (12,000 ft) volcano known as Mount Mazama during an enormous eruption approximately 7,700 years ago.
What zone of volcanism is Crater Lake?
Crater Lake
| Basic Data | |
|---|---|
| Volcano Number Last Known Eruption Elevation Latitude Longitude | 322160 2850 BCE 2487 m / 8159 ft 42.93°N 122.12°W |
| Subduction zone Continental crust (> 25 km) | |
| Population | |
| Within 5 km Within 10 km Within 30 km Within 100 km | 52 52 366 272,674 |
What mountain range is Crater Lake in?
Cascade Mountain range
Crater Lake is located in Southern Oregon on the crest of the Cascade Mountain range, 100 miles (160 km) east of the Pacific Ocean. It lies inside a caldera, or volcanic basin, created when the 12,000 foot (3,660 meter) high Mount Mazama collapsed 7,700 years ago following a large eruption.
What plate boundary is Kilauea on?
Pacific Plate
Now, Hawaii is in the middle of the Pacific Plate which is the biggest plate in the Pacific Ocean (the biggest of all, in fact, measuring around 103 million square kilometres). And all these plates are on the move.
How is the caldera Lake formed?
A caldera is a large depression formed when a volcano erupts and collapses. During a volcanic eruption, magma present in the magma chamber underneath the volcano is expelled, often forcefully. Some calderas form a lake as the bowl-shaped depression fills with water.
What is the terrain like in Crater Lake National Park?
The park is 249 square miles of evergreen trees, fields and water. The annual snowfall is more than 44 feet, so the cliffs and trees are often white with snow. Volcanic eruptions and later weaker activity in the park is responsible for the park’s most memorable geographical features.
What is the primary geology of the bedrock in Crater Lake?
Mazama. Alternate layers of various types of rocks indicate that this was a stratovolcano. Most of the rock in the vicinity of Crater Lake is porphyritic andesite, a volcanic rock intermediate between the acidic rocks containing much silica and alumina, and the basic rocks containing the ferro- magnesian minerals.
What is Kilauea’s tectonic setting?
It stretches from the southern tip of South America, up the coast of North America, across the Bering Strait, down through Japan, and into New Zealand. The activity is a result of the Earth’s tectonic plates being subducted – this is where one plate moves under another and is forced into the mantle – and recycled.