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Volcanic eruptions
Alpine systems
The countries in the ring of fire. Google it.
geologist
Michigan
collision of tectonic plates
Shield volcanoes have effusive eruptions. Effusive eruptions are a volcanic phenomenon; in some ways the opposite of explosive eruptions. An effusive eruption is characterized by an outpouring of low viscosity lava which has a fairly low volatile content. Usually, shield volcanoes have effusive eruptions.
collision of tectonic plates
California, Alaska and Japan are all locations that have frequent earthquakes.
The ring of fire has the most active volcano's in the world
That is most likely to be Basalt, also called bluestone
A widening of a lake for example. It is a physical barrier. Not forest fires or volcanic eruptions.