주제별 자료/환경,기타

내륙의 말라가는 거대한 호수들은 과연 인간들의 활동 때문일까?

bus333 2018. 2. 28. 11:53

출처 : NASA 오늘의 사진 2018.02.25 'Bonneville Salt Flats'


East of the Bonneville Flats lies the growing urban area around Salt Lake City,
which is barely visible to astronauts during the day due to the low contrast with the surrounding mountains.
In contrast, the colorful waters of the Great Salt Lake stand out against the desert landscape.


The Bonneville Salt Flats are remnants of a large lake that inundated much of Utah between 14,000 and 32,000 years ago.
The greatest extent of ancient Lake Bonneville was about 520 kilometers (320 miles) long and 220 kilometers (130 miles) wide.
The lake was fed by glacial melt water during the spring and summer seasons of the most recent glacial period.
Since Lake Bonneville had no outlet, that water eventually evaporated in place and left behind white salt minerals.


지리 수업시간에 다루는 호수 면적 축소를 얘기할 때는

위의 빨간색 부분도 꼭 함께 다루면 좋겠습니다~만은

저도 못했네요 ㅠ.ㅠ


From the vantage point of the ISS,
landscape patterns reveal the intermingling of older geologic formations and more recent landforms in this region.
The relatively young (in geologic terms) Bonneville Salt Flats are located within the Basin and Range Province,
a region that formed from the stretching of Earth’s crust by massive tectonic forces over the past 17 million years.
At the top left, we see a different style of geology:
the Middle Rocky Mountain region, separated by the active Wasatch Fault zone.
This fault zone has violently disrupted the region with at least 22 large-magnitude earthquakes in the past 6,000 years.