Answer:
because the core is metallic iron and nickle which are denser than the material than in the mantle
The United States achieved its greatest land victory of the War of 1812 at New Orleans. The battle thwarted a British effort to gain control of a critical American port and elevated Maj. Gen. Andrew Jackson to national fame.
Answer:
This type of research is an example of the research method called cross-sectional research.
Explanation:
Cross-sectional research is a research design or method used in observational studies. The reseracher measures the dependent variable in different population groups at the same point in time. The population groups or cohorts are chosen depending on the research question, they can be based on age (like in the example in the question), gender or race, among other categories. Usually the outcomes are compared to one another.
Herbert Putnam, Librarian of Congress
