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Deconstructive and Constructive forces, and The Rock Cycle.

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amira johnson

on 23 December 2014

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Transcript of Deconstructive and Constructive forces, and The Rock Cycle.

What are constructive forces?
Constructive forces are the processes that build up the Earth's surface to deposit sediments and create new land forms.
Crustal Deformation.
Volcanic Eruptions
Volcanic eruptions are constructive forces because when lava cools and builds up over itself, mountains form.
Deconstructive and Constructive forces, and The Rock Cycle.
Some examples of constructive forces include :
1) Crustal deformation
2) Deposition
3)Volcanic Eruption
4) Sediments
When tectonic plates under the Earth squeeze together, the crust bunches or builds up to form new mountains.
Some real world examples of crustal deformation:
1) Agri Valley
2) Taiwan Central Ranges
3) Lake Winnemucca, Basin and Range Province, Nevada
4) San Andreas Fault

Works Cited
Agri Valley (California)
Taiwan Central Ranges
Lake Winnemucca (Nevada)
San Andreas Fault (California)
Some examples of volcanoes include:
1) Mt St Helen's in N. America
2) Mt Fuji in Japan
3) Mount Pinatubo in the Philippines
4) Mount Loa in Hawaii
Mt St Helen's (still very active)
Mt Fuji (active)
Mt Pinatubo (dormant- hasnt erupted for ten years)
Mt Loa (still active)
Deposition is when natural forces lay eroded material in new places. Usually in rivers and streams.
There are no specific examples for deposition but there is :
1) The Nile River
2) Stream Beds
3) Deltas

All the sediments from the edges of Africa flow down to other parts of the Nile ( including the red and white Nile ) and finally stop at Lake Tana. There, all the sediments from the very top are dumped.
Stream bed
The Nile River, stream beds, and deltas are all examples of areas where sediments are carried and deposited.
Sediments are matters the float to the bottom of liquid. Basically, tiny particles of dirt, rocks or sand.
Some examples of Sediments include:
1) rock
2) sand
3) dirt
4) Sedimentary rocks
Sand : it got here because the wind picked it up and carried it...the the sand was then deposited
Dirt: it was carried in the jar and finally settled at the bottom
Sedimentary rocks are particles of sediment that used to travel in rivers and streams. They have been cemented and compacted together to form this rock.
Which leads to the next subject...The Rock Cycle
Definition of the Rock Cycle.
It is called a cycle because it never ends. Rocks are always being melted and crystallized or in other words...transforming.
There are three types of rocks in the rock cycle. Igneous, sedimentary, and metamorphic. All are formed in different processes.
Igneous Rocks.
Magma comes up from the center of the Earth and as it cools at the surface of the crust, the igneous rock forms.
The process by which Igneous rocks are formed is called Consolidation .
There are two types of igneous rocks...Intrusive and extrusive. They are both formed by the same process, but there is a difference. Intrusive Igneous rocks are formed in side the earth while Extrusive Igneous rocks are on the outside

Some examples of Igneous rocks include:
1) Basalt
2) Granite
3) Obsidian
Sedimentary Rocks
Sedimentary rocks form through the process of lithification . Sediments in rivers and streams are tightly compacted and cemented together. Some times you can find animals inside the rock. They are swept up with the particles and become rock. these become known as fossils.
Metamorphic Rocks
Metamorphic rocks get their name from the word metamorphosis meaning always changing. Metamorphic rocks form when other rocks are melted and crystallized. This process is called crystallization.
Examples include:
By: Amira Johnson
7th Hour
What are Deconstructive forces?
Deconstructive forces are the processes that break down the earth and its crust.
Some examples of Deconstructive forces are:
1) Weathering
2) Erosion
Erosion is when natural processes ( wind, rain) break down materials into sediments.
When weather changes the texture or appearance of things
Weathered rocks
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