What type of rocks are formed by sodium rich plagioclase feldspar, biotite, and amphibole

Why is the study of demography important to geographers

The world wars of the twentieth century immediately led to a. the establishment of a communist bloc in eastern europe b. the urbanization of europe’s societies c. an emphasis on humanism d. an emphasis on ties to greek and roman societies select the best answer from the choices provided. a b c d

In the diagram, δgef and δhef are congruent. what is the value of x?