<u>Lahars</u> volcanic hazard is most likely to cause destruction in towns located 30-60 kilometers away from a Cascade Range volcano.
Lahar comes from Indonesian word which describe a mudflow or debris flow that originates on the slopes of a volcano. Small debris flows known to be very common within the Cascades, where they form in the times of heavy rainfall, rapid snow melt, and by shallow land sliding. These relatively small debris flows infrequently give way some miles down valleys. Inside the Cascades, the word lahar is normally reserved for larger events that occur in addition with volcanic eruptions, and travel many miles down valleys and affects the local communities. Lahars may occur by rapid melting of snow and ice during eruptions, by liquefaction of giant landslides (also called debris avalanches), by breakout floods from crater lakes, and by erosion from fresh volcanic ash deposits during heavy rains. Amid and immediately following volcanic eruptions, lahars can demeanor the foremost severe hazard to more populated valleys downstream from Cascades volcanoes.
So, the lahars volcanic hazard can cause destruction in towns located 30-60 kilometers away from a Cascade Range volcano.
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Theory of Continental Drift
If you take a look at a map of the earth today, you will see the current locations of broken land masses that constitute the earth. However, would you believe if someone told you that these broken land masses were once connected to each other as one huge supercontinent? Well, this claim was made in the 90’s by Alfred Wegener, a German polar researcher, meteorologist and geophysicist who died in 1930.
Wegener’s theory of continental drift states that the existing continents of the earth were once glued together forming a super landmass. Over time, the landmass broke and drifted away and is still drifting to this day. In his proposal, he stated that the super content, which he named Pangaea, meaning ‘’all earth” once existed. The supercontinent was surrounded by water bodies, mainly oceans, and seas.
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