(true or false) a single volcano can erupt lavas of different composition?

True - the lavas will always be of a slightly different compostion. There are main types of lava - acidic or basic and this depends mostly on the temperature at which the magam below the earths surface is heated and the type of rock that is below the Earth's surface. The heat determines which chemicals are melted from the rock below the earth's surface. My point is this: heating and rock type below a single volcano usually stays the same but we will almost certainly have slight differences in these two things such as chemical changes and mineralogy in rocks so volcanoes will produce lavas of different compositions but with only slight changes in composition