1. Explosive eruptions: These eruptions are characterized by violent explosions that release large amounts of ash, gas, and pyroclastic material (hot, fast-moving debris). They are often associated with thick, viscous lava that traps gases, leading to pressure buildup. Examples include the eruption of Mount Vesuvius in 79 AD, which destroyed Pompeii and Herculaneum.

2. Effusive eruptions: These eruptions are characterized by slow, steady flows of lava that are less violent. They are often associated with thin, fluid lava that allows gases to escape easily. Examples include the eruption of Kilauea in Hawaii, which has been erupting continuously since 1983.

It's important to note that there are many different types of eruptions within these two main categories, and each eruption is unique. The specific type of eruption depends on factors such as the composition of the magma, the amount of gas present, and the surrounding geology.