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Part 5 - Forces Inside Earth
A. Moving Earth
Pangaea (Alfred Wegener) –
Forces inside the Earth are constantly reshaping its surface
Theory of Plate Tectonics –
Plates include continents, parts of continents, and parts of the ocean floor.
Plates sit on streams of nearly melted rock called magma
Magma acts as a conveyor belt moving plates around
B. Earthquakes
Occur when plates slide together
They often happen at seams in Earth’s crust known as faults
Faults -
Some go unnoticed, but some destroy buildings and cities
C. Volcanoes
Movement of continental plates creates great pressure inside the Earth
Volcanoes -
Lava -
Volcanoes also blast large amount of rocks, ash, and poisonous gases into the air during
an eruption
D. Natural Hazards
Environmental events that threaten people’s lives and property
Include volcanoes, earthquakes, tornadoes, landslides, and floods.
People who live in these areas usually take precautions to protect themselves
Architects now design buildings to withstand natural disasters