ancient oceanの例文

例文

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1. The machines bored through soil that once lined the bottoms of ancient oceans.
2. Ancient oceans left behind chalk subsoil deposits when they receded 70 million years ago.
3. He developed the use of boron isotopes for determining the pH of ancient oceans.
4. Other scientists have suggested that features seen nearby are indicative of an ancient ocean floor.
5. They discovered the oscillations by analyzing climatic signals in ancient ocean sediments in the North Atlantic.