Constructive Forces

GPS: S5E1. Students will identify surface features of the Earth caused by constructive and destructive processes. Identify surface features caused by constructive processes. • Deposition (Deltas, sand dunes, etc.) • Earthquakes • Volcanoes • Faults Essential Question: How do constructive forces change the Earth’s surface?

What is a constructive force? A constructive force is a process that raises or builds up the surface features of the Earth. Examples are: Deposition- (sand dunes, delta, sea shells) Earthquakes Volcanoes Faults

Deposition Deposition is the dropping or depositing of sediment by water, wind, or ice. Deposition builds up new land on Earth’s surface, like a delta at the end of a river or a sand dune built by the piling up of sand. Sea shells on the beach are an example of deposition.

Sand Dunes

Deltas A delta is a landform that is formed at the mouth of a river.

Earthquakes Earthquakes are vibrations on Earth’s surface caused by sudden movement on Earth, often along a fault, a break in the Earth’s surface. Large earthquakes can cause landslides and tsunamis. http://www.brainpop.com/science/earthsystem/earthquakes/

Fault Lines A fault line is a break or fracture in the ground that occurs when the Earth's tectonic plates move or shift and are areas where earthquakes are likely to occur.

Volcanoes Volcanoes are mountains with an opening in the Earth’s crust. Magma, gases, and ash come through the opening to reach Earth’s surface. When the magma erupts from the volcanoes, the top of the mountain can be changed. The top of the mountain can get larger or explode off. The ash and lava can destroy forests and farms. http://www.brainpop.com/science/earthsystem/volcanoes/