This is a good example of how cold water has entered the rock and as it has frozen and thawed, the rock over time has slowly spread apart. This is called frost shattering.
This is a place to share your learnings in Geography 12 with other students. You will be required to make at least one post each week. You will be evaluated on your posts so demonstrate geographic vocabulary, knowledge, and thinking. Take it seriously but have fun with it too!
Monday, February 28, 2011
MUDSLIDE
Sunday, February 27, 2011
LANDSLIDE
A landslide is when dry mass of earth and rock slide down. Events that can trigger a landslide is when the oversteepening of slopes by eurison associated with rivers, glaciers, and heavy snow melt. An earthquake can also play a part in it because as it shakes it can create a weak slope. It can destroy everything and there is no way to stop it. It is so powerful can it can destroy anything.
FROST SHATTERING
SYNCLINE
SUBDUCTION ZONE
The Subduction Zone is created by when one tectonic plate moves under another tectonic plate. The plates are constantly moving so when they subduct it is beneficial in many ways. They create formations such as mountain ranges,ocean trenches, earthquakes, and volcanoes. When these two plates subduct one of them is younger and and less dense then older plates so they can converge. The Subduction Zone has high activity which can form earthquakes deadly to humans and volcanoes than can be helpful to humans. So it can be helpful and dangerous to some humans.
Friday, February 25, 2011
Sill
Rock Fall
Rock falls occur when a piece of rock on a steep slope becomes dislodged and falls down the slope. Debris falls are similar except they involve a mixture of soil, regolith, vegatation, and rocks. A rock fall may be a single rock or a mass of rocks, and the falling rocks can dislodge other rocks as they collide with the cliff. Because this process involves the free fall of material, falls commonly occur where there are steep cliffs. At the base of most cliffs is an accumulation of fallen material termed talus. This is an obvious danger to humans if they are in the path of the falling rocks.
Thursday, February 24, 2011
Soil Creep
Soil Creep is the slow downhill movement of soil. This results in tree trunks that are curved at the base, tilted utility poles, fence posts, and causes retained walls to be broken or overturned. This can effect humans in a negative way because trees and poles can fall on roads. Therefore causing accidents and they can also fall on buildings causing structural damage.
Hydrolysis
Fault
a fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement
faults are created by the ground generating vibrations-or waves-in the rock that we feel as the ground is shaking. Faults are weaknesses in the rock and therefore earthquakes tend to occur over and over along the same faults.
This feature affects humans by when earthquakes occur, peoples homes and towns get wrecked.
This is a satellite image of the country of France, satellite images can be used to monitor weather patterns and/or aid in the accurate production of maps.
Mudslides
Keelung mudslide
Excessive rain and an absorbent type of soil were factos that caused a landslide that buried a three story building in keelung City on sunday. The absorbent clay soil and the high volume of accumlated rainfall over hte past month most likely caused the hillside to slip. Also the drains near the building were too narrow to handle the runoff from the rain, which cuased overflows and loosened the soil and rocks near the building. Six of the nine people who were trapped in the warehouse have been rescued, two of whom were badly injured. The other three managed to get out before the rescue workers arrived.
Brazilian landslide of 2011
This is an image of a major disaster that occured January 2011 in Brazil -- a landslide.
Major precipitation that occured the night prior triggered some of the deadliest landslides in Brazilian history. Many peoples homes were destroyed, their cars were lifted by the landslide, and crushed into other things. The death toll continuously climbed, and millions were left without parents, children, and family members. Thousands of civilians were lost in the landslide, buried alive or brutally murdered by mother nature. This costed the country billions to recover.
Biotic Weathering
frost shattering
Frost Wedging
Avalanche
This is an image of an avanlanche occuring on Mount Everest. An avalanche is when the snow that has accumulated on a slope gives way and comes rushing down the slope/mountainside in a devastating wave of snow, ice and potentially rock.
Argentina Mudslide
This avalanche was caused by extreme amounts of precipitaion (rain, and or hail and snow). The excess mass on the side of the mountian cause tremendous amounts of snow to barrel down the mountian and destroying everything in its path. It can cause extreme stuctural damage and cost millions of dollars. Also, it claims human lives.
Weather Satellite
Biotic Weathering
This is sandstone that has been broken up by frost shattering. Frost shattering occurs when water finds its way into cracks and crevices in the rock and freezes. The freezing of the water causes it to expand which exerts force on the rock and can cause it to crack further or break apart entirely, as seen in the picture.
Frost Shattering
In this photo, Forst shattering the mechanical weathering and breakdown of rocks is occurring.Frost shatterings ocurrs in the cracks in the rocks areas where the temperature fluctuates around 0'C. The alternating processes of frost shattering slowly widens the cracks and in time, causes pieces of rock to shatter from the main rock.
Oxidation
Frost Shattering to the max.
Frost shattering occurs in the joints and cracks of rocks, because during the day the temperature fluctuates and at night the water inside the cracks freezing creating expansion. When the frozen water (called ICE) melts, the crack of the rock has now become too big to hold on, and the small fragment which was held together by a string (smaller side of the crack) falls off, making it appear that the rock has been spilt in two. Woooohooooo.
North Vancouver Landslide
In 2008 a landslide occured in North Vancouver. The house in this image above clearly shows the destruction that a landslide can do. After hard rainfall, the ground gave away because of the loose soil. Building homes on steep inclines can also put a lot of pressure on the soil, causing it to slide away, which is what occured in this event.
Frost Shattered Rock
This picture is of a rock that has been shattered. The result is from the process of water entering the rock's cracks, and freezing. It then begins to cause the rock to break apart due to the expansion of the frozen water.
Monday, February 21, 2011
Strike-Slip topic #3
A strike slip fault is when to opposing continental plates are adjacent to the other and the two go opposite ways against the other and catch. Eventually the pressure builds up between the two plates and it snaps and slips as seen in the picture seen left. This fault line is most noticeable in places such as the San andreas fault line. This fault type affects people in the way if structures or rivers are alone the fault line with will tear them in two or displace them. i.e this farmer woke one day to see one side of his far did not agree with the other.
Subduction zone topic#2
Subduction zones are when a plate usally oceanic will subduct or go under another plate usually continental. The plate will go under the other into the asthenosphere and can create volcanoes and earthquakes. This is important to the rock cycle and preservation of new earth resources sprouting form volcanoes, creating fertile soil and oppurtunities for new forests to sprout over ones destroyed by pyroclastic flows. Subduction zones can also greatly affect people, earthquakes displace, kill and maim many every year and destroy structures more efficiently than any weapon of mass destruction. Volcanos have also proven to be very dangerous to surrounding towns and cities that live in the shadow of a dangerous sleeping giant.
Tuesday, February 15, 2011
Volcanic Neck
A volcanic neck is a cylindrical-shaped land form that stands above the Earths surface. They are created by magma solidifying in the vent of a volcano and are called a volcanic neck/plug when the rest of the volcano erodes away. This feature does not really affect humans in any way, it's just a good tourist attraction.
Monday, February 14, 2011
Reverse Fault
Reverse faults are exactly the opposite of normal faults. If the hanging wall rises relative to the footwall, you will have a reverse fault. Reverse faults occur in areas undergoing compression. If you imagine undoing the motion of a reverse fault, you will undo the compression and thus lengthen the horizontal distance between two points on either side of the fault.
Laccolith
A laccolith a sheet intrusion that has been injected between two layers of sedimentary rock. They tend to form at very shallow depths. Could cause the crust to rise.
This is a pyroclastic flow. These devestating phonomena are caused when a composite volcano explodes. Pyroclastic flows are massive clouds of superheated ash and rock that roll down the mountian and into the surrounding areas, destroying everything in its path. This is a pec of merapi volcano. Even though volcanos can produce these devestating forces, humans still remain at the base of volcanoes for access of mineral rich soil.
Lava
Lava is magma that has came from a volcano to the surface. It moves at a rate of a few kilometers per hour, and rates as high as 60 km per hour. It contains abundant iron, magnesium components. It can be as hot as 1,000 degress celcius and 1,2000 degrees celcius. It laters cools and hardens. Pahoehoe is freely flowing lava. Pillow lava is the hardened shaped lava.
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