What is the function of maleic anhydride

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy

How are the terms group and period used on the periodic table