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Natural Phenomena Science Educational Posters & Charts
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educational posters > science posters > geology > natural phenomena < weather
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Natural phenomena posters and charts make great teaching resources for the classroom and home schoolers. Posters include images of auroras, comets, craters, eclipse, earthquake, floods and droughts, petrified forests, geysers, glaciers, icebergs, meteors, sand dunes, rainbows, volcanos, and waterfalls.
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Earthquakes
Terremoti, Tremblements de Terre, Erdbeben, Terremotos
• geology posters
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Earthquakes
When the plates of the Earth's crust move and collide with each other the forces create vibrations. These vibrations are commonly known as earthquakes. Earthquakes occur around the globe almost non-stop. Some are barely detectable and others create such destructive vibrations that whole cities can be shaken down to little more than rubble. Although volcanic eruptions and atomic explosions can cause earthquakes, most occur along plate boundaries where techonic forces build up.
• more Earth Processes posters
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Flood
A flood (from the Old English flod) is water that sits outside of the normal perimeters of a river, lake, or ocean.
Floods can be caused by heavy rains in tropical storms, heavy seasonal rainfall, and rapidly melting snow; coastal flooding can occur with high tides combined with storms that surge the ocean water inland.
Floods can cause loss of life from drowning, severe economic hardships from crops destroyed and water contaminated with diseases, and damage to the built environment.
Floods can also deposit nutrient rich soil along rivers such as the Tigris-Euphrates, the Nile, Indus, Ganges, and Yellow, that supported ancient civilizations with reliable food sources.
Nations and communities use levees, reservoirs and sea walls as barriers to damage from floods such as dikes in The Netherlands, the River Thames Barrier, and the series of hydroelectricity producing dams built by the Tennessee Valley Authority (TVA) that also control seasonal flooding.
The term "The Flood" usually refers to the great Universal Deluge described in Genesis in the story of Noah's Ark.
The Great Flood of 1993 occurred in midwestern US, along the Mississippi and Missouri Rivers and their tributaries, from April to October, and in some categories, the even surpassed the 1927 flood, at the time the largest flood ever recorded on the Mississippi River.
• flood- Wild Weather poster
• West Virginia posters
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Erosion & Weathering
Wind, rain and other forces are constantly shaping and rearranging the Earth's surface. This process of change is known as erosion and weathering. Erosion is the process of removal and transportation of Earth's materials by natural forces. These forces can include rain, wind, rivers, glaciers, earthquakes, and volcanoes.
Weathering is similar to erosion except it does not include the transportation of materials. It is the process of rock breakup resulting from exposure to the atmosphere. Mechanical weathering involves the physical breakup of rock, without altering the chemical makeup of the minerals compounding it. An example of mechanical weathering is when ice expands to break apart rock. If the chemical makeup is altered, it is referred to as chemical weathering. Rust is a form of chemical weathering.
• more Earth Processes posters
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Types of Weathering Poster-
features up-close, full-color photos which will help students visualize and understand the effects of physical, mechanical and chemical weathering on various objects.
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Glaciers
In the regions closest to the poles, or regions so high in elevation that snowfall accumulation exceeds the amount that melts off over long periods of time, glaciers can be formed. As the snow compacts into ice, the weight causes it to begin moving down a mountain, carving huge valleys and sculpting mountains. Motion and change are what glaciers are all about. Glaciers have been responsible for shaping most of the Earth's surface, either by direct carving from the ice flow or from the water runoff caused by glacial melting. As the glacier carves and breaks down rock, it can relocate massive amounts of rock over large areas. Glaciers typicaly move slowly, but great land transformations over a short geological time period (such as 100 years) have been recorded.
• more Earth Processes posters
• Antarctica posters
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A rainbow, the optical and meteorological phenomenon of a spectrum of light that appears in the sky when the Sun shines onto droplets of moisture in the Earth's atmosphere, take the form of a multicoloured arc, with red on the outer part of the arch and violet on the inner section of the arch.
• national parks posters
• river posters
• colors posters
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Volcanoes
Deep inside the Earth, heat and pressure cause solid rock to melt into a liquid known as magma. In some areas around the globe this magma has risen to the surface and erupted, creating volcanoes. Volcanoes are generaly classified into three types: Shield Volcanoes, Composite Cone Volcanoes and Cinder Cones.
Shield volcanoes are broad, domed mountains formed from highly liquid magma flowing and cooling slowly to form rock. As one eruption cools another eruption flows over it, building layers of cooled lava flows. These volcanoes erupt primarily liquid magma, or lava, as it is called once it reaches the Earth's surface.
Composite cone volcanoes are more explosive in nature. The lava fragments are cooled in the air, forming pyroclastic material. The next eruption might be more liquid, thus it has alternating layers of pyroclastic material and lava flows. This type of volcano has much steeper sides.
Cinder cones are primarily built up with pyroclastic material around a central vent. This is common in larger volcanoes.
• more Earth Processes posters
• volcano posters
• more mountain posters
• geology posters
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