- 1 Where are the Scablands in Montana?
- 2 Why does Lake Missoula no longer exist?
- 3 How long did it take Lake Missoula to empty?
- 4 What caused the Channeled Scablands?
- 5 How many times did Lake Missoula Flood?
- 6 What are three unique features observed in the Channeled Scablands of Central Washington?
- 7 How long did Lake Agassiz exist?
- 8 Which flood caused human error?
- 9 Who was the first person to present the theory of the Lake Missoula Floods?
- 10 What is the largest flood in history?
- 11 What happened to Glacial Lake Missoula at the end of the last ice age?
- 12 How did Lake Bonneville disappear?
- 13 Why is it called Scablands?
- 14 Why is it called the Palouse?
- 15 Who discovered the source of the Channeled Scablands flood water?
Where are the Scablands in Montana?
When Glacial Lake Missoula’s ice dam shattered, a northern arm of the lake drained in a matter of hours through a narrow gap in Montana’s Blackfoot River valley. One can only imagine the extraordinary upheaval that took place along this portion of the gap as the flood pounded through.
Why does Lake Missoula no longer exist?
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.
How long did it take Lake Missoula to empty?
It is estimated that the maximum rate of flow was equal to 386 million cubic feet per second. At that rate, the lake probably drained in a few days.
What caused the Channeled Scablands?
The channeled scabland was created where the Ice Age floods accelerated across the tilted surface of the Palouse slope, causing massive erosion. Much of the eroded sediment was carried all the way to the Pacific Ocean.
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.
What are three unique features observed in the Channeled Scablands of Central Washington?
Distinct geomorphological features include coulees, dry falls, streamlined hills and islands of remnant loess, gravel fans and bars, and giant current ripples. The term scabland refers to an area that has experienced fluvial erosion resulting in the loss of loess and other soils, leaving the land barren.
How long did Lake Agassiz exist?
The history of Lake Agassiz in North Dakota covers approximately 2,700 years, from 11,700 years ago until 9,000 years ago.
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?
Who was the first person to present the theory of the Lake Missoula Floods?
In 1940, Pardee went public with his theory about Lake Missoula, stating his belief that the entire lake had drained catastrophically. In 1965, age 82, Bretz received a telegram of surrender from the remaining disbelieving geologists (many others were dead by now).
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.
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.
How did Lake Bonneville disappear?
As the Ice Age ended the climate became warmer and drier. With less rainfall and glacial melting to sustain Lake Bonneville, coupled with increased evaporation, the vast lake began to retreat. The current Great Salt Lake’s drainage area is roughly that of ancient Lake Bonneville.
Why is it called Scablands?
The early settlers in eastern Washington referred to these areas as scablands because they were not suitable for farming. During the last ice age 10,000 to 20,000 years ago, part of a glacier blocked the Clark Fork River in northern Idaho that normally flowed into Washington near what is now Spokane.
Why is it called the Palouse?
Geography and history was converted by French-Canadian fur traders to the more familiar French word pelouse, meaning “land with short and thick grass” or “lawn.” Over time, the spelling changed to Palouse.
Who discovered the source of the Channeled Scablands flood water?
Two exceptional geologists, J [no period after the J] Harlen Bretz and Joseph T. Pardee, are credited with deducing the erosional mechanism and water source that created the Channeled Scablands.