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What is an Earthquake

What is an Earthquake
Introduction to Earthquakes & Tsunamis Turn on the TV or read the newspapers and almost always there is something devastating happening somewhere as a result of sheer nature's power. Examples of such natural occurrences are hurricanes, tornados, wildfires, volcanic eruptions, flooding, earthquakes and tsunamis. These are usually not caused directly by humans, but their effects live with us for a long time. In this lesson we shall look at one of such natural occurrences...earthquakes! What is an Earthquake? Simply, earthquakes are the rumblings, shaking or rolling of the earth's surface. Earthquakes come in many forms. Foreshocks, Mainshocks and Aftershocks: Sometimes, there are smaller shocks that occur before (foreshock) and after (aftershock) a main earthquake (mainshock). Earthquakes are also called temblors. It is important to understand the earth’s makeup to help understand earthquakes better. The Mantle is semi-molten rock, also called magma. Related:  Even - Grade 5/6 - Natural DisastersСајтови на енглеском језику

What is a flood? Introduction to Flooding Many of us have this idea that floods (or flooding) is simply, too much water around your house. People think that can be fun. Flooding is extremely dangerous and has the potential to wipe away an entire city, coastline or area, and cause extensive damage to life and property. What is a flood? It is a natural event or occurrence where a piece of land (or area) that is usually dry land, suddenly gets submerged under water. When floods happen in an area that people live, the water carries along objects like houses, bridges, cars, furniture and even people. Floods occur at irregular intervals and vary in size, duration and the affected area. It is important to note that water naturally flows from high areas to low lying areas. In this lesson, we shall see more about what causes flooding, the types of flooding, some effects of floods and what we can do before, during and after floods occur.

Why Was the Destruction So Severe? | Inside Disaster: Haiti Six weeks after the Haiti shock, Chile was struck by an 8.8-magnitude earthquake. It was 500 times more powerful than the Haiti quake, yet killed less than 1% of the Haitian total. In this section, we explore answers to the question: why was the Haiti earthquake so destructive? This Flash piece is 525 x 372. To embed it in your site, copy and paste the following code. <script type="text/javascript"> var file="destruction_slideshow.swf"; var width = 525; var height = 372; </script><script type="text/javascript" src=" Too wide? Click on images below to launch related videos. Building Codes “The poverty in Haiti lends itself to people building where they want, how they can … not everybody’s going to be able to build to the exacting standards that a building code requires.” Unlike in other countries located on or near fault lines, very few of Haiti’s buildings were constructed for earthquake resistance. Construction Materials Learn More

Disasters - preparedness/Civil Defence Image: Earthquake survival kit by Global X on Flickr We have selected these online resources to support you when you need information relating to civil defence and preparing for disasters. SCIS 1702159 See also Earth science - Volcanoes; Earth science - Tsunami; Disasters - Natural; Disasters – New Zealand; Extreme weather The Environmental Protection Agency in the United States lists ways to reduce risks to health and the environment from natural disasters. Suggested level: intermediate, Get Through The Get Through website is designed to help people get ready and be prepared in a disaster situation, it includes; household emergency plans, checklists, how to prepare and what to have in a getaway kit. Suggested level: intermediate, LandSAR A brief history of the Land Search and Rescue organisation and what they do. Suggested level: primary, intermediate, ManyAnswers Ready Ready kids Books

Natural Disasters 1. Most natural disasters are caused by weather. Weather disasters can be caused by hurricanes, tornadoes, floods, tsunamis, thunderstorms, wind storms, wildfires, avalanches, and blizzards. 2. 3. 4. 5. 6. 7. 8. 9. 10. Earthquake! ©1995 The Regents of the University of California (576K) Earthquake Picture- Walking the line- Click for bigger version Introduction Earthquakes are one of the most powerful natural forces that can disrupt our daily lives. Why do earthquakes occur? Why do some locations such as Califonia and Japan receive so many earthquakes? Can earthquakes be predicted? Can we design a city to better withstand an earthquake? Can we stop earthquakes before they occur? This lesson will guide you through several activities to help you think like a geologist. Teacher Plans What is an earthquake? Perhaps you remember being in an earthquake--the ground rumbles, hanging lamps begin to sway back and forth, shelves begin to rattle or spill their contents, the floor and walls shake.... An earthquake is the shaking of the earth caused by pieces of the crust of the Earth that suddenly shift. Definitions and Glossary Focus: Focus is the location within the earth where underground rock moves and sends out earthquake waves.

What is a volcano? Introduction to volcanoes The earth's mountains, plains, plateaus, soils, rocks, etc. as we see it today is believed to have gone through many phases, with about 80% of it being carved out by the action of volcanoes. A volcano is simply a rapture (opening or vent) on the earth's surface (crust) through which molten magma (extremely hot mixture of gases, lava, ash and other burning substances) escape on to the earth's surface. How do Volcanoes look like? In May 1980, the Mountain St. Volcanoes occur at weak zones or points in the earth’s crust (including constructive and destructive boundaries). For history lovers… In A.D. 79 (really long ago) two Roman cities, Pompeii and Herculaneum, were completely buried in ash and dust in a matter of hours after a volcanic eruption. The word, ‘volcano’ was made out of the name of a Roman god of a small island in the Mediterranean sea of Sicily called ‘Volcan’. Now we shall see in a bit more detail how volcanoes come about.

Weather Wiz Kids weather information for kids Earthquakes(Earthquakes are not associated with weather, but instead are natural disasters.) What is an earthquake?Earthquakes are the shaking, rolling or sudden shock of the earth’s surface. They are the Earth's natural means of releasing stress. More than a million earthquakes rattle the world each year. The West Coast is most at risk of having an earthquake, but earthquakes can happen in the Midwest and along the East Coast. Click Here to learn more about earthquakes from USGS. What causes an earthquake? Click Here to see an animation of an earthquake. What are plate tectonics? What is a seismograph? Click Here to calculate the strength of earthquakes! Click Here to see an animation of an earthquake and the resulting tsunami. Know the Lingo EPICENTER - The point on the earth's surface directly above the source of the earthquake.SEISMIC WAVES - The energy created by the quake travels in waves from the epicenter, where they are the strongest. Richter Scale Earthquake Safety Tips

Earthquake Facts The origin of the name of the San Andreas Fault is often cited as the San Andreas Lake. However, based on some 1895 and 1908 reports by geologist A.C. Lawson, who named the fault, the name was actually taken from the San Andreas Valley. He likely did not realize at the time that the fault ran almost the entire length of California! The fastest wave, and therefore the first to arrive at a given location, is called the P wave. The “Ring of Fire” also called the Circum-Pacific belt, is the zone of earthquakes surrounding the Pacific Ocean — about 90% of the world’s earthquakes occur there. The greatest mountain range is the Mid-Ocean Ridge, extending 64,374 km (40,000 mi) from the Arctic Ocean to the Atlantic Ocean, around Africa, Asia, and Australia, and under the Pacific Ocean to the west coast of North America. Subduction is the process of the oceanic lithosphere colliding with and descending beneath the continental lithosphere.

Information on wildfires for young people Out of the many natural disasters we have, wild fires would be one that is very common, very difficult to fight, and maybe the most dangerous. What is a fire? Simple, it is the visible part of a combustion. This is simply a gas found in air. Fuel: Fuel is any kind of combustible material. Heat: Heat is thermal energy. Hazard: Earthquake/Be smart Map Information: The map is titled, "Forecasted Frequency of Earthquake Shaking Capable of Causing Damage Within the United States". It depicts a map of the continental United States, Puerto Rico, Alaska, and Hawaii and illustrates state and county boundaries. The intensity of forecasted shaking (corresponding to level VI on the Modified Mercalli Intensity scale) is capable of the following: cracking windows; knocking dishes, glassware, knickknacks, and books off shelves and pictures off walls; moving or overturning furniture; and cracking weak plaster, adobe buildings, and some poorly built masonry buildings. Data source is the USGS National Seismic Hazard Mapping Project, updated in the following years: contiguous US-2014, Alaska-2007, Hawaii-1998, Puerto Rico and the US Virgin Islands-2003; forecasted frequency of a horizontal ground acceleration on firm rock of at least 7.2% g, which is an average acceleration corresponding to an MMI of VI.

National severe weather Step into the wild world of weather! What is a wall cloud? What's the difference between a watch and a warning? Is it ever “too cold to snow”? Learn all about thunderstorms, tornadoes, hail, lightning, floods, damaging winds and severe winter weather. Thunderstorms There can be as many as 40,000 thunderstorms each day around the world. Learn more → Tornadoes Much about tornadoes remains a mystery. Learn more → Floods Except for heat-related fatalities, more deaths occur from flooding than any other weather-related hazard. Learn more → Lightning Lightning is one of the oldest observed natural phenomena on earth. Learn more → Hail Hail can cause billions of dollars of damage to structures, crops and livestock. Learn more → Damaging Winds Straight-line winds are responsible for most thunderstorm damage. Learn more → Winter Weather Forecasting winter weather accurately is very difficult because a degree or two of temperature change can mean the difference between snow or freezing rain. Learn more →

Faultline: Theory of Plate Tectonics The answer is that some places on the earth's surface are, literally, on the edge. During its early years, the earth's outer layer was much hotter than it is today. Over time, the surface of the earth cooled and hardened. These collisions are more than just momentary shake-ups. The theory that describes this movement is called plate tectonics. Twenty-five years after Wegener's death, scientists discovered a deep trench beneath the Atlantic Ocean where molten rock from inside the earth welled up and then cooled in the ocean waters, creating new rock. Most seismic action arises not from diverging plates, but from plates of the earth striking each other.

Weather Wiz Kids weather information for kids

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