A globular cluster is a collection of stars in the form of a sphere that orbits a galactic core. Global clusters are generally tightly bound by gravity, making the stellar density higher toward the center, and giving them their spherical shapes. Globular clusters are usually found in the halo of a galaxy.
The fact that the gravitational pull of a globular cluster is rather weak means that a single supernova explosion can blow the interstellar gas out of a globular cluster. This would mean that the gas left is not dense enough to form new stars. After the first generation, globular clusters cease to form new stars because they lack material due to their deficiency in heavy elements.
Rock types and elevation
Explanation:
Most boundaries between landscape regions are usually indicated by sharp changes in rock types and elevation.
Some times we move from a region dominated by igneous rocks to metamorphic terrains and so on.
- Abrupt lithological changes are usually evident when we cross landscape regions.
- Also the elevation between the two places can change.
- Most times when we move from the inland to the coastal areas, we notice that elevation decreases rapidly.
- Rock types and elevation are good indicators of changes in landscapes.
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Given the significantly different levels of optimism in the research from the past 30 years, it is still unclear how electrical induced polarization (IP) contributes to the petrophysical calculation of shaliness and permeability. As a result, opinions on the potential value of IP approaches within the context of formation evaluation are divided.
The wide dispersion of data previously revealed by IP-shaliness-permeability correlations has been narrowed through novel empirical linkages including time-domain induced polarization (IP) parameters. It is shown that chargeability and excess conductivity or intergranular permeability can be connected smoothly and unambiguously. Several connections have been established based on studies of water-saturated sandstones throughout a broad range of electrolyte conductivity.
As long as three formation constants have been identified through laboratory testing, their field application is feasible. The potential value of induced polarization measurements for petrophysical evaluation is briefly reviewed in light of these findings with greater assurance than was previously justifiable.
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