3 Geological Features Lexi Wadsworth
Folded Mountain- Mont Blanc • How Mont Blanc formed: This Feature was formed when two plates move together. This can be where two continental plates move towards each other or a continental and an oceanic plate move towards each other. The movement of the two plates forces sedimentary rocks upwards into a series of folds. Fold mountains are usually formed from sedimentary rocks and are usually found along the edges continents. This is because the thickest deposits of sedimentary rock often build-up along the edges of continents. When plates and the continents riding on them collide, the built-up layers of rock crumple and fold like a tablecloth that is pushed across a table. • Where Mont Blanc is located: The mountain lies in a range called the Graian Alps, between the regions of Aosta Valley, Italy, and Haute-Savoie, France. The location of the summit is on the watershed line between the valleys of Ferret and Veny in Italy and the valleys of Montjoie Valley and Arve Valley in France.
Ocean Trenches- Mariana Trench • How Mariana Trench formed: Ocean trenches are formed at a specific type of plate boundary called a subduction zone. These zones occur when an ocean plate collides with another ocean plate or with a continental plate. Ocean plates are made of a more dense rock than continental plates; when a dense ocean plate collides with another ocean plate or a continental plate, the denser plate "subducts", or sinks back into the mantle. When this subducting plate sinks into the mantle it creates a deep trench in the ocean floor. The deepest spot on the crust is the Mariana trench in the Pacific ocean, some seven miles deep. • Where the Mariana Trench Is Located: The Mariana Trench is located in the western Pacific Ocean, to the east of the Mariana Islands.
Composite Volcano- Mount Fuji • How Mount Fuji was formed: Sometimes called Stratovolcanoes, Composite volcanoes form when runny lava escapes through a fissure and flows down the volcano. It is built up by many layers (strata) because of this hardened lava, tephra, pumice, and volcanic ash. The lava that flows from Stratovolcanoestypically cools and hardens before spreading far.Stratovolcanoesare characterized by a steep profile, periodic explosive eruptions, and quiet eruptions, although there are some with collapsed craters called calderas. • Where Mount Fuji is located: Mount Fuji is located on Honshu Island; it is the highest mountain in Japan at 3,776.24 m. Mount Fuji is about 100 kilometres south-west of Tokyo, and it can be seen from there on a clear day.