Volcanos
The most violet volcanoes occur at a destructive plate boundary and hot spots. Before an eruption magma and gases build up in the magma chamber. When the pressure becomes too great the volcano erupts through a pipe called a vent, ejecting hot lava, gases, ash and rock fragments. The materials are known as pyroclastic. The top of the volcano can be blown off, the hole that is left is a crater. E.G Mount St Helens 1980 eruption, Washington USA
Soil creep
Soil creep occurs as soil moves very slowly down gentility slopes at a speed of 1cm per year. This is the slowest form of mass movement. We only notice the effects on the landscape from the clues it leaves after many years.
Landslide
A landslide is a sudden movement of rock, soil and debris down a slope due to gravity. It happens when the stability of the slopes is weakened by factors such as heavy rainfall, deforestation and/or human activities like construction of roads, rail or buildings. These factors reduce friction and support causing materials to slide donhill
Mass movement
Mass movement is the movement of loose material (regloth), down hill due to the earths gravity
Positive dam impacts
HEP generation, provides renewable electricity, reducing fossil fuel reliance.
Water supply and irrigation, ensures that stable water access for drinking, farming and industry.
Negative dam impacts
Displacement, flooding forces communities to relocate,
Environmental damage, alters ecosystems, disrupts fish migration, and causes erosion.
