Can someone help me ? I need to put this into my own words?

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

What are the two largest greenhouse gases

Who discovered a pattern to the elements in 1869?