The present paper investigates Rayleigh-Taylor instability of a fluid completely confined in an Buy Ugg Uk
arbitrary region bounded by rigid walls in the presence of a uniform magnetic field applied in an arbitrary direction. It is shown that the Buy Ugg Boots Cheap
results of S. Chandrasekhar (Proc. Cambridge Philos. Soc.51 (1955), 162–178), M. B. Banerjee and N. L. Kalthia (J. Phys. Soc. Japan30 (1971), 1494–1497), and R. Hide (Proc. Roy. Soc. London Ser. A223 (1955), 376–396) are of wider generality and applicability than the simple context in which they have been derived by these authors.
Environmental changes (purely physical changes) need to be distinguished from environmental problems (environmental issues that affect peoples lives). An environmental problem is a cultural construct and cannot be divorced from a particular economy and culture. Hence any study of, or proposal to, mitigate drought and land degradation must take account of land-use systems and the relationship between environment and society. A framework for understanding environmental problems such as drought and land degradation is suggested, which seeks a better definition of environmental problems.