Aida Ahmadzadegan
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Blue Hole
We've all heard about black holes, but here's a blue hole.
It's the Great Blue Hole, off the coast of Belize in Central America. It's over 300 meters across and 120 meters deep. It's in the Belize Barrier Reef Reserve System, which is considered a World Heritage Site by UNESCO.
What made this hole?
Sinkholes form when underground limestone slowly gets dissolved and washed away by slightly acidic rainwater, forming caves, and then the surface of the ground collapses. The Great Blue Hole formed during two separate ice ages. During an ice age, the sea level is much lower! So, this sinkhole didn't form under the ocean. It formed on land.
The Great Blue Hole began to form 150,000 years ago, during the second to last ice age: the Wolstonian glaciation. That ice age ended around 130,000 years ago at the start of the Eemian interglacial. The sea rose, and the Great Blue Hole was flooded.
The most recent ice age, the Wisconsin glaciation, started about 110,000 years ago. The sea level dropped. The Great Blue Hole continued to get bigger, in several separate stages.
And then the most recent ice age ended. Sea levels rose by about 120 meters! This was mostly finished about 10,000 years ago.
There are also many sinkholes on land in Belize and the Yucatán Peninsula, where they are known as cenotes. Often they're connected to underwater cave systems... but apparently not to the Great Blue Hole.
http://en.wikipedia.org/wiki/Great_Blue_Hole
We've all heard about black holes, but here's a blue hole.
It's the Great Blue Hole, off the coast of Belize in Central America. It's over 300 meters across and 120 meters deep. It's in the Belize Barrier Reef Reserve System, which is considered a World Heritage Site by UNESCO.
What made this hole?
Sinkholes form when underground limestone slowly gets dissolved and washed away by slightly acidic rainwater, forming caves, and then the surface of the ground collapses. The Great Blue Hole formed during two separate ice ages. During an ice age, the sea level is much lower! So, this sinkhole didn't form under the ocean. It formed on land.
The Great Blue Hole began to form 150,000 years ago, during the second to last ice age: the Wolstonian glaciation. That ice age ended around 130,000 years ago at the start of the Eemian interglacial. The sea rose, and the Great Blue Hole was flooded.
The most recent ice age, the Wisconsin glaciation, started about 110,000 years ago. The sea level dropped. The Great Blue Hole continued to get bigger, in several separate stages.
And then the most recent ice age ended. Sea levels rose by about 120 meters! This was mostly finished about 10,000 years ago.
There are also many sinkholes on land in Belize and the Yucatán Peninsula, where they are known as cenotes. Often they're connected to underwater cave systems... but apparently not to the Great Blue Hole.
http://en.wikipedia.org/wiki/Great_Blue_Hole
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