2020 LTS airport announcement and Iceland intro draft: Difference between revisions

Iceland's volcanoes are often strato-volcanoes, in contrast to the shield volcanoes of Hawaii - the C172p tutorial airport (PHTO) is located in a town at the foot of to 2 huge shield volcanoes. Strato-volcanoes have steeper sloping sides, as the lava that comes up often is more viscous for periods of time - it flows less easily, like honey compared to water. This lava becomes hard before spreading far. Lava, before it reaches the surface, is called magma. Strato-volcanoes have periods where the magma coming up is viscous, and eruptions can be explosive - as gasses dissolved in the magma remain trapped. These eruptions can cause craters. Shield volcanoes only tend to have magma that flows easily, so they have very shallow slopes (as low as 5 degrees) as the lava spreads far. Iceland does have shield volcanoes, but they are smaller. The volcanoes you see have been eroded depending on how old they are