• A natural disaster is the consequence or effect of a natural, hazardous event, occurring when human activities and natural phenomenon become entangled.
• A physical event, such as a volcanic eruption, earthquake, hurricane, tsunami, landslide, etc.Read More...
• A volcano is a landform (usually a mountain) where molten rock erupts in the Earth’s crust.
• A lot of pressure underground pushes up the molten rock.
• As pressure in the molten rock (magma) builds up, it needs to escape somewhere.
• This pressure in the molten rock (magma) comes from the mantle of the Earth and reaches the crust through cracks.
• The molten rock rushes out through a vertical tunnel called a vent and fills a hollow crater at the top.
• Once the magma erupts through the earth’s surface, it’s called lava.Read More...
• The world's largest active volcano is Mauna Loa in Hawaii, where famous coffee is grown in the rich volcanic soils.
• Mauna Loa is 13,677 feet above sea level.
• Dormant volcanoes are those that have not erupted in a long time but may erupt in the future.
• Some of the well known examples of dormant volcanoes are:
POINTS TO REMEMBER
• Volcanoes are usually in the form of conical mountains.
• Magma is liquid rock inside a volcano.
• Lava is liquid rock (magma) that flows out of a volcano.
• Earthquakes are the shaking, rolling or sudden shock of the Earth’s surface.
• They are the Earth's natural means of releasing stress.
• They are caused by severe shock waves that travel through solid rocks from underground to the surface.
• Earthquakes can be felt over large areas although they usually last less than one minute.
• Earthquakes cannot be predicted.
• The point under the ground where the earthquake begins is called the focus and the corresponding spot on the surface is called the epicentre.Read More...