Final answer:
Large-scale volcanic eruptions can cause a drop in global temperatures by releasing gases and particles into the atmosphere that reflect sunlight back into space, leading to a cooling effect on the climate.
Step-by-step explanation:
Large-scale volcanic eruptions can indeed cause a drop in global temperatures. When a volcano erupts, it releases gases and particles into the atmosphere. These particles can reflect sunlight back into space, leading to a cooling effect on the climate. An example of this is the eruption of volcanoes in Iceland in 1783, which caused haze-effect cooling and resulted in lower global temperatures for one or more years.