The statement "lava cools quickly and forms minerals with small crystals" is generally true. When lava cools rapidly, it does not have enough time for the minerals within it to grow large crystals. This is because the atoms and molecules in the lava do not have enough time to move around and arrange themselves into a regular, crystalline structure. As a result, rapidly cooled lava tends to form a fine-grained or glassy texture, with small crystals or no crystals at all. Conversely, when lava cools slowly, it allows for the formation of larger crystals, resulting in a coarser-grained or porphyritic texture.