Baltes and his colleagues have led the way in documenting the evolution of lifespan psychology in general, and the study of adult development and aging in particular. through their work they have found seven core assumptions consistent with the view that influences current lifespan developmental theory.

Contextual meta-theoretical view

Explanation:

Meta contextual is the subject matter of theory. All the researchers use meta theory to exemplify their research whether it is correct or not. If we say in a more specific and restricted manner that mathematical researches are about the meta theory of mathematical theory. In psychology it provides researchers a rich source of the concepts that help in the theories and concepts, methods emerge during researchers. Meta theories are the sub or small part of the theories from different concepts. It works as meta-analysis works in which sub-parts are combined and then do the research. A meta theory is also a concept like a meta-analysis in which small theories are combined that provide a great source of concepts and methods that emerges after the combination of these theories.

loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.