How many grams are in 4 moles of cu(cn)2

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 several ways to reduce the effect of friction

The point along a planet's orbit where it is closest to the sun is called the