How Landslides Work" See more pictures of natural disasters. When it comes to natural disasters, the tornadoes and tsunamis of the world tend to get all of the attention. Rarely do landslides seize as many headlines as the volcanoes and earthquakes that can cause them. But when the ground literally rips downhill, the effect is often more damaging than the trigger. Landslides are a form of mass movement, a term used to describe any sort of gravity-induced movement of sediment down a slope. There are many different kinds of mass movements categorized by the type of material involved, the way it is moved and how fast it moves. Although the word landslide often is used (incorrectly) to encompass many types of mass movements, a landslide is actually something more specific. In this article you'll learn what happens if a landslide happens underwater, why deforestation and water don't mix and just how powerful (and hot!)
What causes tornadoes? Americans know tornadoes like no one else. The U.S. averages at least 10 times more twisters each year than any other country on Earth, and their intensity is infamous — the worst can be a mile wide, rotate at 300 mph and plow along at 70 mph. Yet despite being target practice for these atmospheric power drills, America's tornado mythos is still cloaked in mystery and misunderstanding. That's understandable, considering tornadoes' stealthy nature — sudden appearances, erratic behavior and brief lifespans make them elusive subjects to study — but science has nonetheless learned a lot in recent decades. Tornadoes can occur any time of year, but they wage all-out war on the U.S. during spring and summer. How tornadoes work Tornadoes produce the strongest winds on Earth, but they owe all their energy to the chaotic clouds that birth them. Before a thunderstorm forms, winds begin quickly changing speed and direction. Where and when tornadoes strike How to survive a tornado
Rock Cycles cycles Rock Cycles Even rocks have a cycle. Rocks are continually circulating in the mantle just below the crust of the earth. Once on the surface of the earth, rocks cool down. Sample some of the following activities to learn more about rocks and their cycles. Places To Go People To See Things To Do Teacher Resources Bibliography Places To Go The following are places to go (some real and some virtual) to find out about rocks and their cycles. Ayers RockVisit famous Ayers Rock in Australia. Devils Tower National MonumentVisit Devil's Tower in Wyoming. Easter IslandStroll along the beaches of Easter Island. The Formation of the HimalayasVisit the Himalayas. The Geology of the Grand CanyonErosion is part of the cycle of how rocks erode from wind, water, glaciers, and shifts in temperature. The Giant's CausewayTravel to the Giant’s Causeway in Antrim, Northern Ireland to study some unusual igneous rocks. Grand Canyon ExplorerVirtually visit the Grand Canyon. How Do Soils Form? People To See
IRIS Seismic Monitor - Recent Earthquakes The actual min mag shownon the map is about 4.2,to get a uniform distribution. Yellowstone's Volcano Bigger Than Thought | Supervolcanoes SALT LAKE CITY — Yellowstone's underground volcanic plumbing is bigger and better connected than scientists thought, researchers reported here today (April 17) at the Seismological Society of America's annual meeting. "We are getting a much better understanding of the volcanic system of Yellowstone," said Jamie Farrell, a seismology graduate student at the University of Utah. "The magma reservoir is at least 50 percent larger than previously imaged." Knowing the volume of molten magma beneath Yellowstone is important for estimating the size of future eruptions, Farrell told OurAmazingPlanet. Supervolcano trail Geologists believe Yellowstone sits over a hotspot, a plume of superheated rock rising from Earth's mantle. The magma chamber seen in the new study fed these smaller eruptions and is the source of the park's amazing hydrothermal springs and geysers. Scientists have updated this image of Yellowstone volcano's underground magma chamber. Clearer picture
Seismic Waves" This content is not compatible on this device. Click the play button to start the earthquake. When P and S waves reach the earth's surface, they form L waves. The most intense L waves radiate out from the epicenter. When you toss a pebble into a pond, it creates radiating waves in the water. There are several types of seismic waves. Primary waves (or P waves) are the fastest moving waves, traveling at 1 to 5 miles per second (1.6 to 8 kilometers per second). Secondary waves (also called shear waves, or S waves) are another type of body wave. Unlike body waves, surface waves (also known as long waves, or simply L waves) move along the surface of the Earth. How do scientists calculate the origin of an earthquake by detecting these different waves?
When Exploding Whales Goes Horribly Wrong Yesterday we brought you the story of a blue whale that washed up on the shore of a small town in Canada. The people in the town don’t have the resources to deal with the carcass properly, but aren’t getting any help from the federal government. Dead whales become grossly inflated from gas buildup as they decompose, so the clock is ticking as the people of Trout River decide what to do. Luckily, they have a perfect example of what NOT to do thanks to the town of Florence, Oregon who were faced with a similar situation in 1970. Unfortunately, the amount of dynamite was not properly calculated and the result was quite messy. [Image hat tip NPR] Map of The World - Shaded Relief
El Proyecto Matriz - The Matrix Project Supervolcano eruptions may not be so deadly after all - environment - 29 April 2013 It was the biggest bang in human history. Around 75,000 years ago, the Toba supervolcano exploded on the Indonesian island of Sumatra, blasting enormous volumes of gas and ash into the air. Yet a new analysis suggests it had little impact on the climate, or on humans. Supervolcanoes are capable of releasing more than 1000 cubic kilometres of material in one eruption, enough to cover an entire continent with ash. Toba's eruption produced vast quantities of sulphur dioxide, a gas that behaves in the opposite way to a greenhouse gas – it cools Earth by increasing the atmosphere's ability to reflect the sun's rays back into space. Chemical clues Christine Lane of the University of Oxford and her colleagues were looking for clues to past climate change in the sediments at the bottom of Lake Malawi when they came across a layer of ash from the Toba eruption. Geophysicist Alan Robock of Rutgers University in New Brunswick, New Jersey, isn't convinced. Muted cooling More From New Scientist
Water on, in, and above the Earth - USGS Water Science for Schools The USGS Water Science School A Beta version of the new USGS website has been released for public comment.Use the "Feedback" button at bottom of every Beta page to tell us what you think. As the saying goes ... "water, water, everywhere." Well, how much water is there; where is this water; how does it move around? Use the diagram below to find out (select "Menu of all Earth's Water topics" to see a more complete list). Investigate the water cycle (in many languages!)
wwf - Footprint calculator | The ecological footprint calculator is not mobile or tablet compatible. Read more about how you can change the way you live to reduce your footprint. | Australia's ecological footprint Australia has one of the world's largest ecological footprints per capita, requiring 6.25 global hectares per person. If the rest of the world lived like we do in Australia, we’d need the regenerative capacity of 3.6 Earths to sustain our demands on nature. We have been exceeding the Earth's ability to support our lifestyle. And we can. Would you like to measure your ecological footprint to see how the way you live is impacting the planet and what you can do to reduce it?