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Because of the plate tectonic
mantle plume
Tectonic Activity- activity that occurs as a result of tectonic plate movement, for example: earthquakes, volcanoes, and mountain building in general.
A tectonic plate is a massive, irregularly shaped slab of solid rock. These plates can make volcanic activity, mountains, and several other things as well.
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The volcanic and earthquake activity in the Pacific Northwest is mainly caused by the movement of the Juan de Fuca tectonic plate being subducted beneath the North American plate. This subduction process creates pressure and friction, leading to volcanic eruptions and seismic activity in the region.
The East African Rift Valley is a tectonic plate boundary where the African Plate is splitting into two, creating stunning landscapes and volcanic activity.
It would most likely form from hydrothermal activity related to a volcano.
Volcanoes in Canada are mostly located in these regions due to their proximity to tectonic plate boundaries where volcanic activity occurs. British Columbia is part of the Pacific Ring of Fire, a region known for its volcanic and seismic activity. Similarly, the Yukon Territory also lies along a tectonic boundary, resulting in volcanic activity in these areas.
The Philippines is located on the boundary of two tectonic plates: the Philippine Sea Plate to the east and the Eurasian Plate to the west. This boundary is characterized by frequent seismic and volcanic activity, making the Philippines prone to earthquakes and volcanic eruptions.
Convergent boundaries, where tectonic plates collide, can cause volcanic activity due to the subduction of one plate beneath another. This process can lead to the formation of volcanic island arcs, such as Japan or the Aleutian Islands.
The growth of the Hawaiian island chain is primarily due to the movement of the Pacific tectonic plate over a hotspot in the Earth's mantle. As the plate moves, volcanic activity at the hotspot creates new islands, with the oldest islands in the chain found in the northwest and the youngest in the southeast.