To identify a rock which two characteristics do geologists study

Which summarizes the relationship between density of an element and its distribution in earth? a. the greater an element’s density, the greater the amount of it found in the crust. b. the denser an elements is, the smaller the amount of it earth core. c. the greater an elements density, the smaller the amount of it’s found in the crust

Which of the following countries has declared itself nuclear free

Plzz on what physical process is responsible for the creation of volcanoes, earthquakes and ocean trenches at the plate margins?