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A very dry area that did not receive any rain for a minimum of 12 straight months or an arid area that receives less than 10 inches of rain every year is called a desert.Other than lack of rain, another reason for aridit... More »

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A biome is defined by the interactions of climate, geology, and local flora and fauna. These factors are influenced by geographical location. For example, regions near the equator are often hot, wet and teeming with life... More »

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The acronym "STP" stands for standard temperature and pressure, as defined by the International Union of Pure and Applied Chemistry. It is defined as a temperature of 273.15 degrees Kelvin and a pressure of 100 kilopasca... More »

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A tropical rain forest is a biome that gets at least 79 inches of rain every year and has a year-round temperature of between 68 and 95 degrees Fahrenheit. Biologists believe that as many as 30 million species of plants ... More »

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Stalagmites form when rain water or melted snow seeps through the cracks and rocks of caves and drips down to the floor. The mineral deposits that remain create stalagmites that grow higher as more material drips down. More »

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Mechanical weathering occurs due to situations such as wind, rain, ice or lava that carry away materials. Mechanical weathering is a set of geological phenomena that causes rocks, soil and minerals to break down without ... More »

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Wind and rain erode rock to begin the formation of siltstone. The rock particles break down further as they travel with the water and then settle to the bottom of the water when it slows. Layers of silt accumulate, creat... More »

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