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? 75 degrees, to 80 degrees, as these are formed by a composite volcano 5 degrees, to 10 degrees, as these are formed by a composite volcano 5 degrees, to 10 degrees, as these are formed by a shield volcano 75 degrees, to 80 degrees, as these are formed by a shield volcano