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Constructive and Destructive Forces

Elizabeth Franklin for choice board

Donna Bryant

on 16 May 2014

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Transcript of Constructive and Destructive Forces

Constructive and Destructive Forces
Volcanoes are both destructive and constructive forces. They are constructive because cooled lava is good for the soil. Volcanoes are destructive because the lava can start fires and burn things like houses, trees, and people.
Some forces are only constructive, while others are destructive. Some are even both constructive and destructive. Most forces are both, but some can only help or only harm the environment. Either way, these forces are parts of life as we know it.
Tsunamis are destructive forces and are caused by earthquakes. The earthquake causes the sea floor to shake and a gigantic wave comes up out of the ocean and goes onto the land. They are destructive because they knock down houses and can cause floods.
A destructive force is one that breaks up the land.
A constructive force is one that builds up the land.
Deposition is when sediments or particles are dropped by ice, wind, or water. Sediment is picked up in one place, carried along, and dropped someplace else. Water is the main agent of deposition. Deposition is a constructive force because it makes land bigger, but it is also a deconstructive force because it has to take sediments or particles from another place.
Floods are destructive forces because the water seeps into houses and ruins furniture and other belongings. It is destructive also because the water stops people from driving, playing outside, and doing other activities. Some floods can get bad enough that people have to use a canoe to get places.
Earthquakes are both constructive and destructive forces. They are constructive because they can trigger a volcano, which is partly constructive. Earthquakes are destructive because they can make cracks in the ground and can knock down unstable buildings and bridges.
Levees are makeshift dams. Levees help keep water from oceans, lakes, or rivers from coming onto land and flooding.
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