Explain how a gas is used to move a hot air balloon

Based on the position vs. time graph which velocity vs. time graph would correspond to the data

What three things determine the shape and size of a puddle when water is poured out onto a surface

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.