Which element is used to "paint" the skin to prevent infection from cuts and scratches?

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

Is 343 in the sequence -5, -2, 1, 4, 7

Who determined the nature of chemical bonds?