The eruption of the composite volcano is known to be very explosive because the amount of pressure tends to build up. That is why the composite volcano is known as the deadliest volcano. So, when the volcano explodes, all of the pressure is released causing the results to be destructive. After there is no more volcanic activity, or when the volcano is dormant, erosion will start wearing the cone down. The main cone is worn down to reveal the hard lava neck inside the conduit after thousands of years. After more eruption, the “volcanic neck”, which is the result of erosion, abolishes any remnants of the cone. Some examples of composite volcano eruptions is Mount Saint Helens on May 18, 1980. Many acres of vegetation were wiped out, and about 60 people and many animals died. Mount Pinatubo is another example; it erupted in 1992 in the Philippines. The eruption killed about 350 people. However, composite volcanoes do not erupt as often as shield volcanoes. Another after-effect of eruptions is the formation of a caldera. A caldera is formed when volcanoes disintegrate. In addition, they vary in shape and size depending on the size of the original volcano. Usually, the location of a caldera is a sign of a new composite volcano. An example of a caldera formed by a composite volcano is Crater Lake in Oregon. The lava is known to block the vents of the volcano, so that is why the eruption is hazardous. Composite volcanoes usually have andesite lava.There are three main types of lava that volcanoes have: andesite, dacite, and rhyolite. Andesite lava usually is dense and has a thick consistency. It consists of “quartz and feldspar minerals”.The lava flows through a pipe called the main vent. The volcano’s source is known as a conduit system, which is a reservoir deep inside the Earth. The lava flow is pyroclastic, meaning the flow has high speeds; it also has temperatures as high as 752 degrees Fahrenheit. Pyroclastic flows consist of pieces of dry and hot rock. There are two different types of pyroclastic flows. One mixture is “a basal flow” with gruff chunks. There is also the storm “cloud of ash” that advances higher than the “basal flow”. Different volcanoes have different types of lava flows. For example, Mt. Etna and Mt. Fuji both have “basaltic lava flows”. On the other hand, Mt. Rainier in Washington, has andesite lava. Composite volcanoes are not always destructive, they can also be helpful. Like any other volcano, composite volcanoes also have benefits. Minerals from the volcano causes rich farmland. Volcanoes are also used to power geothermal stations through the use of turbines.