Geographical Processes - The Formation - Landslides. Australian Government - Australian Emergency Management Institute. Landslides are the movement of large amounts of earth such as rock, soil, sand, mud or the combination of any of these.
The earth’s land is dynamic and is always moving. It moves very slowly and is calculated to be moving about a few centimetres each year. This is one reason why we have landslides. Some other factors in causing landslides are: VolcanoesEarthquakesOther vibrations in the earth due to machinery, blasting, construction and mining.Erosion as a result of loss of vegetation, rivers, floods or the ocean’s waves.Avalanches that can be caused by significant changes to the amount of moisture that seeps into the land.Moisture levels can change in the earth from agriculture, the farming and irrigation of fields, or the melting of snow and ice. All these elements are contributing factors in destabilising the earth.
When land is destabilised, particularly on sloping, mountainous or land with even a slight gradient – landslides can occur. Landslides vary in size. What is a Landslide? Severe damage to road caused by landslide A landslide is the movement of rock, debris or earth down a slope.
They result from the failure of the materials which make up the hill slope and are driven by the force of gravity. Landslides are known also as landslips, slumps or slope failure. Some of the most common types of landslide in Australia are earth slides, rock falls and debris flows. The movement of landslide material can vary from abrupt collapses to slow gradual slides and at rates which range from almost undetectable to extremely rapid. Landslides can be triggered by natural causes or by human activity. They can also vary in their extent, with some occurring very locally and impacting a very small area or hill slope while others affect much larger regional areas. Sinkholes, from USGS Water-Science School. Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by groundwater circulating through them.
As the rock dissolves, spaces and caverns develop underground. Sinkholes are dramatic because the land usually stays intact for a while until the underground spaces just get too big. If there is not enough support for the land above the spaces then a sudden collapse of the land surface can occur. Causes, Effects and Types of Sinkholes. A common emotion in many novels is wishing that the ground would open up and swallow the person whole.
While it makes for great literary drama, it can be terrifying the same happens in real life. Imagine standing on solid ground one minute and tumbling down a deep hole the other. That is a reality experienced by those who have fallen into sinkholes. These holes open up suddenly, without any indications of what is to happen. Understanding how such a hole can appear without any warning may seem difficult, but in fact is quite simple. Sinkholes are found all over the world. Sinkhole Information - Water Quality Services - Environmental Utilities. What Is Cancer? Cancer Symptoms, Causes, Treatment - What are cancer symptoms and signs? What are cancer symptoms and signs?
Symptoms and signs of cancer depend on the type of cancer, where it is located, and/or where the cancer cells have spread. For example, breast cancer may present as a lump in the breast or as nipple discharge while metastatic breast cancer may present with symptoms of pain (if spread to bones), extreme fatigue (lungs), or seizures (brain). A few patients show no signs or symptoms until the cancer is far advanced. The American Cancer Society describes seven warning signs that a cancer may be present, and which should prompt a person to seek medical attention.
The word CAUTION can help you remember these. Other signs or symptoms may also alert you or your doctor to the possibility of your having some form of cancer. Anyone with these signs and symptoms should consult their doctor; these symptoms may also arise from noncancerous conditions. One's own research should not replace consulting a health-care provider if someone is concerned about cancer.
What is cancer? Types Of Cancer. A to Z List of Cancer Types. Use the alphabet links to find and retrieve information about a particular type of cancer. (The A to Z list is also available in Spanish.) Ductal Carcinoma In Situ (DCIS) Causes of cancer - Cancer Council Australia. We do not know all of the risks and causes of cancer.
However, there are a number of chemical, physical and biological agents that have been shown to trigger the mistakes in the cell blueprint that cause cancer. These are called carcinogens and include tobacco, ultraviolet radiation and asbestos. A number of cancers share risk factors: one in nine cancers, and one in five cancer deaths, are due to smokingabout 3% of cancers are related to alcohol consumptionmany cancers occur as a direct result of dietary influences, from infectious agents or exposure to radiation (especially skin cancers from ultraviolet radiation)some cancers result from inherited ‘faulty’ genescancer is NOT caused by injury or stress. It is important to note that not all cancers are associated to the risk factors mentioned above. For further information: Head to our iheard site to read our evidence based answers to popular myths and claims about cancer risks, prevention, screening and treatment.
How you can help. How Many Types of Cancer are There? (with pictures) One thing that concerns me about the many types of cancer that exist in the world is that some of the more rare forms can be forgotten about because of publicity for the major types.
This means that if you become afflicted with some out of the ordinary cancer type, the likelihood of our science movements working on it are quite diminished. What is cancer? - Cancer Council Australia. Cancer is a disease of the body's cells.
Normally cells grow and multiply in a controlled way, however, if something causes a mistake to occur in the cells' genetic blueprints, this control can be lost. Cancer is the term used to describe collections of these cells, growing and potentially spreading within the body. As cancerous cells can arise from almost any type of tissue cell, cancer actually refers to about 100 different diseases. Cancer cells that do not spread beyond the immediate area in which they arise are said to be benign ie. they are not dangerous.
If these cells spread into surrounding areas, or to different parts of the body, they are known as malignant - commonly referred to as cancer. Types of cancer - Cancer Council Australia. About cancer Join our network Quicklinks Types of cancer This section provides an overview of a number of common cancers in Australia, looking at incidence, mortality, prevention, detection, symptoms, risk factors and treatment.
The information contained in this section should not be used for individual medical advice. For further information This page was last updated on: Wednesday, October 15, 2014 About us Events.