Sentences with phrase «lake bottoms thousands»
Diatomaceous earth is mined from underwater beds or from ancient dried lake bottoms thousands of years old.
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If the lake were thousands of years old, it would probably have a flat bottom, the result of fine sediments gradually filling it up.
These appeared to be the remains of someone who died and sank to the bottom of the lake many thousands of years ago.
Once the bottom of a large glacial lake, these rolling sand hills are home to vegetation such as lodgepole pines as well as plant species that arrived via Berengia thousands of years ago.