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Free sign up"core sample" is correct and is commonly used in written English.
It is a term used in the field of geology and refers to a sample taken from beneath the surface of the Earth. For example: The geologist took a core sample from the site to study its composition.
Dictionary
core sample
noun
A cylindrical section of a naturally occurring substance, typically obtained by drilling into the substance, for example sediment or rock, with a core drill.
Exact(60)
Each tube contains a core sample of the seafloor.
The core sample is used as a timeline.
Sharing market hotness, they form a useful core sample.
Consensus matrices, the empirical cumulative distribution function plot and core sample identification.
Aqueous polymer solutions have been injected into a core sample.
SXSW is a kind of pop music census: a core sample of what's happening Right This Second Now.
When the coring tube is driven into the ocean floor, friction exerts a downward pull on the core sample.
The core sample of 4 cm is recommended for upper layer, and 5 cm or 6 cm is recommended for the core sample of middle and lower layer.
Lifting the core sample by its grassy top, he showed how the soil clung to the roots, another effect of all that microbial activity.
In January 2000, a forensic archaeologist took a core sample from the cemetery, now covered by the four-acre St . Georgemunicipal parking lot.
He made a core sample, a square of turf and soil as wide and deep as his spade, then lifted it gently and laid it on the grass.
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