Volcanoes are openings in the earth's crust from which hot gases, lava, ashes, etc., are thrown up, forming a cone-shaped hill or mountain with a central crater.
Earthquakes are a shaking or vibrating of a part of the earth's surface, caused by an underground shift of plates.
Natural disasters are volcanoes or earthquakes or weather related phenomenon such as tornadoes or hurricanes.
Man-made landforms or landmarks are made by man and not created naturally.
Stream tables are models of the earth using sand and water in a tray. Their intent is to show erosion over hundreds and thousands of years in a simulated situation.
Natural landforms are those shapes of land which have become the way they are due to some type of wind or water erosion.