What is the function of a hypothesis in the scientific inquiry process?

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

Find the mass in grams of 1.37x1020 particles of h3po4

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !