Choose TWO pieces of detailed evidence discovered after Wegener’s death that support his hypothesis. A. Mid-ocean ridges contain minerals that are unseen on continents.
B. Seafloor spreading causes movement of tectonic plates.
C. Convection currents in Earth’s mantle cause tectonic plate movement.
D. Earth’s atmosphere contributes to movement of continents.
E. Seismographs have found faults in North America.
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Which class's questions are these

gravity causes stares to cluster i think so

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.