- 1 Why did the glacial floods form so many lakes?
- 2 How did the Missoula Floods change the landscape of Eastern Washington?
- 3 Who discovered the source of the Missoula flood?
- 4 How did the flood that formed the Scablands happen?
- 5 What is the largest flood in history?
- 6 How many times did Lake Missoula flood?
- 7 How many days did it take Glacial Lake Missoula to drain?
- 8 What was the biggest flood in Washington state?
- 9 What geological evidence did the Bonneville flood leave behind?
- 10 What is a cataclysmic flood?
- 11 Which flood caused human error?
- 12 What happened to Glacial Lake Missoula at the end of the last ice age?
- 13 Why are they called Scablands?
- 14 Could a river have made the Scablands?
- 15 Why did Glacial Lake Missoula form?
Why did the glacial floods form so many lakes?
When the dam broke, a towering mass of water and ice was released and swept across parts of Idaho, Washington, and Oregon on its way to the ocean. Over a period of years the glacier would advance, once again blocking the river, and the dam and the lake would form again.
How did the Missoula Floods change the landscape of Eastern Washington?
While volcanic activity along the Cascade range enriched the soil, a series of floods coming from Montana contributed to the silty soil that has been conducive to many of the Valley’s crops. It also helped the region become a serious wine producer.
Who discovered the source of the Missoula flood?
The Cause. Two geologists, J Harlen Bretz and Joseph T. Pardee, were instrumental in finding the solution to this geologic mystery. Bretz spent a great deal of his life studying the geologic landscape of eastern Washington.
How did the flood that formed the Scablands happen?
This lake formed when a glacier plugged the valley below Missoula during the last ice age, creating a natural dam and eventually a body of water that was half the size of Lake Michigan.
What is the largest flood in history?
The largest known meteorological flood—one caused by rainfall, as in the current Mississippi River flood—happened in 1953, when the Amazon River overflowed.
How many times did Lake Missoula flood?
It was the largest ice-dammed lake known to have occurred. The periodic rupturing of the ice dam resulted in the Missoula Floods – cataclysmic floods that swept across eastern Washington and down the Columbia River Gorge approximately 40 times during a 2,000 year period.
How many days did it take Glacial Lake Missoula to drain?
The repeated filling and collapse of the ice dam would drain an inland sea the size of Lake Erie and Lake Ontario in two days. At its greatest extent, Glacial Lake Missoula stretched eastward a distance of some 200 miles. When the lake rose high enough, it burst through the ice dam.
What was the biggest flood in Washington state?
The National Oceanic and Atmospheric Administration (NOAA) says 1942 holds the record, measured at the southwest waterfront, followed closely by the monster flood of 1936. Old news accounts agree. The 1942 flood was brought on by 5.4 inches of rain that fell in Washington over 77 hours in the third week of October.
What geological evidence did the Bonneville flood leave behind?
The evidence indicates that it existed at least 600,000 years ago. As the climate became cooler and wetter, Lake Bonneville expanded in size, gradually spreading over a surface area of about 20,000 square miles and overlapping into Nevada and Idaho. Because Lake Bonneville was in a basin, it lacked natural outlets.
What is a cataclysmic flood?
Ancient Cataclysmic Floods were the Ice Age Floods that left erosional and depositional features and preceded the Missoula Floods (15-18,000 ka) in the Pacific Northwest of the United States (Allen et al., 2009). Calcrete paleosols at sites with evidence for older floods were all analyzed.
Which flood caused human error?
Question 72 out of 2 points Which flood was caused by human error? Selected Answer:The Teton Dam breach flood Answers:The Indian Ocean tsunamiThe Teton Dam breach flood The Big Thompson Canyon flood The Lake Missoula flood Question 82 out of 2 points Which flood was the result of an ice dam failure?
What happened to Glacial Lake Missoula at the end of the last ice age?
At the end of the last Ice Age, about 18,000 to 15,000 years ago, an ice dam in northern Idaho created Glacial Lake Missoula in Montana. The ice dam burst and released flood waters across Washington and down the Columbia River back flooding into Oregon before eventually reaching the Pacific Ocean.
Why are they called Scablands?
The early settlers in eastern Washington referred to these areas as scablands because they were not suitable for farming. They are known as the “Channeled Scablands ” because they are crisscrossed by long channels cut into the bedrock, called coulees.
Could a river have made the Scablands?
NARRATOR: The rivers and lakes in the Scablands today could not have sculpted this landscape. This water is part of a modern irrigation system and was not here when the Scablands were created. The only river big enough and old enough is the Columbia, which is 50 miles away.
Why did Glacial Lake Missoula form?
Glacial Lake Missoula formed as the Cordilleran Ice Sheet dammed the Clark Fork River just as it entered Idaho. The rising water behind the glacial dam weakened it until water burst through in a catastrophic flood that raced across Idaho, Oregon, and Washington toward the Pacific Ocean.