Sentence examples for strata must be from inspiring English sources

Therefore, reservoir characterization of deep-water strata must be based on direct examination of the rocks and related process-specific facies interpretations, not on wireline logs or on seismic profiles and related process-vague facies interpretations.

In areas like the Edwards Plateau, where pure limestones are interbedded with clay-rich strata, the overlying clay-rich strata must be considered as a possible silicate source to soils on pure limestone bedrock.

"Children currently excluded, the poorest and most marginalized; children from all social strata must be reached.

Strata must be relatively homogeneous within each stratum (small variances of attributes chosen), but heterogeneous among themselves (Mulvey 1983), representing the heterogeneity of vulnerability in the county.

Samples from each stratum must be analyzed to evaluate the properties that will affect its use in reclamation, primarily acid generation and/or neutralization capacity via acid base accounting.

However, in risk-based screening, the evidence for each population stratum must be assessed in order to reach an aggregate value for the population as a whole.

For either of these processes to be effective, the cells of the lower layers, that is, stratum germinativum, must be preserved because they are the only ones that appear capable of restitution or replication.49, 50, 51, 52, 53 Restitution restores epithelial integrity by migration of healthy cells adjacent to an injury over the denuded basement membrane.

Various conditions are mandatory: the repository must not be near a populated area; the rock stratum selected must be deep (300 metres [1,000 feet] or more) and, as much as possible, naturally sealed from aquifers; and any discharge of the water table into the surface waters should be slow.

and therefore, in a set of strata, the youngest layers must be those of the top, and the oldest must lie on the bottom.

In stratified random sampling, the sample size must be allocated to strata in order to optimize both objectives.

However, for the unstratified L-M model the constant assumption must be held within strata, otherwise the model is not valid.