About one hundred thousand years ago, very fluid lava started erupting slowly and gently from a place near a plate boundary. what best describes the slope of the mountain that resulted from such a phenomenon? a. 75 degrees, to 80 degrees, as these are formed by a composite volcano b. 5 degrees, to 10 degrees, as these are formed by a composite volcano c. 5 degrees, to 10 degrees, as these are formed by a shield volcano d. 75 degrees, to 80 degrees, as these are formed by a shield volcano