Volcanoes

Mt. St. Helens has had several different styles of eruptions through its history. The types of eruptions vary from explosive to dome building.

The explosive history of Mt. St. Helens is relatively well known from the May 18, 1980 eruption that captured world attention at the time. The eruption style was typical of this volcano, pyroclastic flows and lahars were both generated. The flank collapse was more than likely a result of the earthquake under the flank at the time, and is believed to have been the trigger of the eruption itself.

Dome building eruptions have been the most common types of eruptions since the 1980 explosive eruption. There have been several lava domes generated since the summit eruption that generated the crater.

Although they have not been witnessed in historical time, Mt. St. Helens does have a history of passive lava eruptions out of flank vents. This type of eruption although it hasn't been witnessed in a rather long time, it is believed that these types of eruptions have been just as common if not more common than the explosive eruptions we have seen in historical times.

an IED can have many different appearances depending on the components that its made of. anything from a cell phone or a washing machine timer with wire leads could be used for ignition, so this is another factor to add into appearance. all about the materials used to make the device.

no, not for at least the last two or three millennia

People still live near Mount Nyiragongo due to several reasons, such as historical ties to the area, limited economic opportunities elsewhere, lack of resources to relocate, and cultural significance of the region. Additionally, some may have a strong attachment to the place despite the risks associated with living near an active volcano.

Andesitic composite volcanoes typically eject pyroclastic material, which includes ash, pumice, and volcanic bombs. These materials are a result of explosive eruptions caused by the high viscosity of andesitic magma, leading to the build-up of pressure within the volcano.

Most of the sea floor is covered with basaltic rock from non-explosive volcanic eruptions. This type of rock is formed when magma cools quickly upon contact with seawater, creating the characteristic pillow-like formations commonly seen on the ocean floor.

Volcanic eruptions can destroy forests through direct impacts like lava flows, ash fall, and pyroclastic flows which can burn or bury trees. The release of toxic gases like sulfur dioxide can also harm plants in the surrounding area. Additionally, the intense heat from an eruption can cause fires that spread through forests.

Around divergent boundaries, land features such as rift valleys, volcanic mountains, and mid-ocean ridges can be found. These features are a result of tectonic plates moving apart, leading to the creation of new crust through volcanic activity and the stretching and thinning of the lithosphere.

no, if a volcano is dormant for centuries is not less dangerous, for example, Mt. Vesuvius in naples, italy. It erupted and demised to whole towns. it waited for centuries to erupt, it could erupt again without warning and possibly be more dangerous.

Yes, Mount Thera, also known as Santorini, is considered dormant rather than extinct. Its last major eruption occurred around 3,600 years ago, but there is still some volcanic activity present on the island.

No, convergent boundaries occur where plates move toward each other and collide or subduct, while divergent boundaries occur where plates move away from each other. It is not possible for a convergent boundary to turn into a divergent boundary because the underlying plate tectonics processes are fundamentally different.

A chain of volcanic peaks or islands that increases in age in one direction away from the hot spot indicates the location of hot spots. This is because the volcanic activity occurs in a fixed location while the tectonic plate moves over it, creating a chain of volcanic features of varying ages.

Yes, lava flows still occur today. Volcanic eruptions can release lava, which flows down the volcano's slopes. Lava flows can pose risks to nearby communities and infrastructure, but they are a natural part of the Earth's geological processes.

Essentially a volcano is a type of mountain.

Mountain are formed due to the collision of 2 continental tectonic plates. The compressing or 'converging' plates forms folds in the crust, and if little erosion has occurred to wear down these folds, they eventually continue to rise and may break to form a buildup of 'thrusts', which build on top of each other and form mountain ranges.

Volcanoes typically occur due to the collision of a continental plate and an oceanic plate, where the denser oceanic plate undergoes 'subduction' and slips under the less dense continental plate. The extreme heat and pressure exerted on this subducting oceanic plate, causing uplifting of magma from the earth's mantle, which rises and breaches the surface, creating a volcano.

There must be some fissure or crack in the crust in order for a volcano to form and the magma to rise through, while mountains are simply the crumpling of two landmasses. But keep in mind, that volcanoes may also later become mountains if they become completely dormant and no more lava (magma that has surfaced) is emitted.

Iceland is a volcanic country known for its geothermal activity and cold temperatures. Its landscape is shaped by volcanic eruptions and geysers, giving it a unique and otherworldly feel.

No, a lighter is not considered an explosive. It generates a flame through a chemical reaction, typically between a fuel source and a spark. However, it does not explode or produce rapid expansion of gases like traditional explosives.

Hot spots in Earth produce volcanic activity, creating regions of intense heat and magma upwelling from deep within the mantle. This can result in the formation of volcanic islands, like the Hawaiian Islands, as tectonic plates move over the stationary hot spot.

Internal features of a volcano include the crator, solidified lava flows (igneous rock), a volcanic conduit, pyroclastics, a magma chamber, areas of contact metamorphism, and sedimentary bedrock

The opening at the surface of the Earth through which volcanic material passes is called a vent. Vents can vary in size and shape, and they are typically found at the top of a volcano or along a fissure during an eruption. Magma rises through the vent and erupts onto the surface as lava, ash, and gas.

Both volcanoes and earthquakes are caused by activity within the Earth's crust. Volcanoes result from the movement of magma towards the surface, leading to eruptions, while earthquakes occur due to the sudden release of energy along faults in the Earth's crust, resulting in ground shaking.

No, Mount Longonot is not an extinct volcano. It is considered to be an active stratovolcano located in Kenya. The last eruption occurred around the 1860s, and it is still considered a potential threat due to its historical activity.

Mount Rainier is composed mainly of andesite lava flows, lahars (mudflows), and volcanic ash. The mountain is also covered by glaciers which contribute to its iconic snow-capped appearance.

Yes, there are explosive arrow heads designed for hunting and military use. These arrow heads are equipped with an explosive charge that detonates upon impact, increasing their effectiveness for certain applications. However, the use of explosive arrow heads may be restricted in some regions due to safety concerns and regulations.

Yes, explosive arrow heads do exist. They are designed to explode on impact or on a delayed fuse to maximize damage and effectiveness. These arrow heads are often used in military operations or hunting large game.

The low death toll during the Mount Pinatubo eruption in 1991 was due to effective evacuation efforts by authorities, as well as the establishment of an extensive warning system prior to the eruption. Volcanic monitoring and timely alerts allowed for the evacuation of over 60,000 residents from the danger zones.