The phrase "a extremely dense" is not correct in written English.
It should be "an extremely dense" because "extremely" starts with a vowel sound.
Example: "The material is an extremely dense substance that is difficult to work with."
Alternatives: "a highly dense" or "an exceptionally dense".
Previous studies at radio and infrared wavelengths--which penetrate the galactic core's shroud of gas and dust--suggested that Sagittarius A harbors an extremely dense concentration of mass.
The ice cream was substantial and chewy, a cross between an extremely dense custard and a fine-grained pudding.
This has two consequences: a pulsar is an extremely dense object known as a neutron star, for which gravitational wave emission is much stronger than for ordinary stars.
As such, any given marker would have an approximately 0.2% chance of falling within a swept region, necessitating an extremely dense screen in order to identify adaptively important loci.
The composite coating exhibited an extremely dense structure with a porosity of 1.5%.
Upward migration of diatom cells to the sediment surface occurs in this benthic community during diurnal low tides, leading to the formation of an extremely dense biofilm in a relatively thin photic layer (the first hundreds of micrometers) [ 41].
This density system has four categories: BIRADS-1 indicates a predominantly fatty breast; BIRADS-2 scattered fibroglandular densities; BIRADS-3 a breast that is heterogeneously dense; and BIRADS-4, the highest level, an extremely dense breast that could obscure a lesion.
The nonideal behaviour of the gas that accompanies further increases in density eventually leads to an increase in viscosity, and the viscosity of an extremely dense gas becomes much like that of a liquid.
Hard Ti2N layers with an extremely dense, featureless structure and a thickness up to 50 μm have been produced.
