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Constructive and Destructive Forces of the Earth

Volcano and Earthquakes!

Joy Foster

on 21 December 2012

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Transcript of Constructive and Destructive Forces of the Earth

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli By Alaina and Joy Constructive and Deconstructive Forces Constructive Force Volcanic Effects The ashes of volcanoes can harden on things like the eruption of Mount Vesuvius (Pompeii).
Some volcanoes can spread poisonous gasses along with lava and igneous rocks.
Volcanoes create craters after they erupt like Crater Lake in Oregon.
Another effect is that lava oozes and forms landforms like Lava Falls, AZ.
The most common place for volcanoes is in the Ring of Fire, located around the Pacific Ocean. Why are Volcanoes Constructive? This force is constructive because it can make islands and mainlands grow larger and larger so people can live there.
These islands and extended mainlands are made when the ash, magma, lava, and volcanic rocks harden.
Grass and other plants like small trees and flowers start to grow in these places where the volcanic substances have hardened.
The soil near a volcano is very fertile, so agriculture grows and gives farmers an advantage in growing their crops.
Destructive Force One of the most deconstructive forces is an earthquake. When plates collide into or pull apart from each other over time, the plates will eventually slip over or under each other and create mountains and volcanoes. But this can also make the ground vibrate and cause earthquakes. An earthquake actually begins below the surface of the earth, at a point called a focus. That's where the pressure in a fault causes it to snap. Shock waves spread from the focus and they push and pull on the crust. They end up pushing the surface of the earth up and down and all around, which causes the destruction of not only buildings and railroads, but destruction to the surface itself. Quake Effects Why are Earthquakes Destructive? One of the most constructive forces is the volcano. This force can occur when the rocks and ash form above a magma chamber after two plates pull apart. A volcano can erupt from different places; the hole on the top of the volcano, but magma can burst out of the sides making vents in the volcano. Volcanoes can form in oceans and on land, so islands and mainlands can be formed and expanded by volcanic ash. An example of this is the Hawaiian islands: Kilauea is still active and making Hawaii's land even larger! Additional Facts About Volcanoes Because of the great amount of ash after Mt. Vesuvius erupted, the entire city and population of Pompeii was completely buried in ash.
Mount Kea is the tallest volcano on the earth at 33,000 feet high, but only a little over 13,000 feet shows from out of the water(it is in the ocean).
Since Mt. Kilauea (in Hawaii) is over a hot spot, it erupts constantly without much hesitation. Tsunamis can be formed and are often up to 100 feet high.
Gas pipes can break and if one spark flies, a giant fire can start and spread quickly (like the 1906 San Francisco quake).
Liquifactions are when an earthquake occurs on wet soil and turns the ground into a thick, muddy liquid (anything and everything will sink in it).
Other effects: flooding, spills of hazardous chemicals, and avalanches.
Earthquakes most often happen around the plate boundaries because that's where the plates meet together. Earthquakes are destructive because they break open the earth's crust.
An earthquake is a sudden shift of the earth's plates and often creates large crevices in the surface.
Earthquakes can also cause avalanches and flash floods which both ruin vegetation and wear down the earth's crust.
Tsunamis also wear down the crust of the earth and kill plants.
Trees give fresh air, and all living things need that fresh air. If these trees are ruined, then earth will not have any inhabitants. Volcano & Earthquake Interesting Facts About Earthquakes! The energy in an earthquake is 10,000 times more powerful than the first atomic bomb!
There are moonquakes, too; earthquakes that happen on the moon!
The shock waves from an earthquake ripple through the land just like they do if you dip your finger in still water.
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