full transcript
From the Ted Talk by Tara Djokic: This ancient rock is changing our theory on the origin of life
Unscramble the Blue Letters
A clue to this puzzle again comes from the ancient rock record. At about 2.5 billion years ago, there is evidence that bacteria had begun to produce oxygen, kind of like plants do today. Geologists refer to the period that followed as the Great Oxidation Event. It is implied from rocks called bneadd iron formations, many of which can be observed as hundreds-of-meter-thick packages of rock which are exposed in gorges that cvrae their way through the Karijini ntanoail Park in wtesern Australia. The aairvrl of free oxygen aollewd two major changes to ocucr on our planet.
Open Cloze
A clue to this puzzle again comes from the ancient rock record. At about 2.5 billion years ago, there is evidence that bacteria had begun to produce oxygen, kind of like plants do today. Geologists refer to the period that followed as the Great Oxidation Event. It is implied from rocks called ______ iron formations, many of which can be observed as hundreds-of-meter-thick packages of rock which are exposed in gorges that _____ their way through the Karijini ________ Park in _______ Australia. The _______ of free oxygen _______ two major changes to _____ on our planet.
Solution
- western
- allowed
- arrival
- banded
- occur
- national
- carve
Original Text
A clue to this puzzle again comes from the ancient rock record. At about 2.5 billion years ago, there is evidence that bacteria had begun to produce oxygen, kind of like plants do today. Geologists refer to the period that followed as the Great Oxidation Event. It is implied from rocks called banded iron formations, many of which can be observed as hundreds-of-meter-thick packages of rock which are exposed in gorges that carve their way through the Karijini National Park in Western Australia. The arrival of free oxygen allowed two major changes to occur on our planet.
Frequently Occurring Word Combinations
ngrams of length 2
collocation |
frequency |
billion years |
7 |
ancient rocks |
2 |
western australia |
2 |
fossil record |
2 |
ancient rock |
2 |
early earth |
2 |
hot springs |
2 |
complex life |
2 |
Important Words
- allowed
- ancient
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- australia
- bacteria
- banded
- begun
- billion
- called
- carve
- clue
- event
- evidence
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- formations
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- geologists
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- iron
- karijini
- kind
- major
- national
- observed
- occur
- oxidation
- oxygen
- packages
- park
- period
- planet
- plants
- produce
- puzzle
- record
- refer
- rock
- rocks
- today
- western
- years