Science test 3 terán andrea
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Transcript of Science test 3 terán andrea
![Page 1: Science test 3 terán andrea](https://reader036.fdocuments.in/reader036/viewer/2022062711/55cecdf0bb61ebe01a8b45d6/html5/thumbnails/1.jpg)
HOW SOIL FORMS
BY: TERÁN ANDREA
7 “C”
MONDAY, NOVEMBER 24,2014
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WHAT IS SOIL?
• SOIL IS THE MIXTURE OF MINERALS, ORGANIC MATTER, GASES, LIQUIDS, AND THE MYRIAD OF ORGANISMS THAT TOGETHER SUPPORT PLANT LIFE. IT IS A NATURAL BODY THAT EXISTS AS PART OF THE PEDOSPHERE.
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HOW DOES SOIL FORM?
• SOIL FORMS AS ROCK IS BROKEN DOWN BY WEATHERING AND MIXES WITH OTHER MATERIALS ON THE SURFACE. IT IS CONSTANTLY FORMED WHEREVER BEDROCK IS EXPOSED.
• SOIL FORMATION CONTINUES OVER A LONG PERIOD, AND GRADUALLY SOIL DEVELOPS LAYERS CALLED HORIZONS.
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WHAT TYPES OF SOILS ARE THERE?
• CLAY SOIL PARTICLES ARE VERY SMALL AND COMPACT. GARDENS WITH THESE TYPES OF SOIL PARTICLES DON’T WORK WELL BECAUSE THE AIR HAS A HARD TIME GETTING TO THE ROOTS.
• SANDY SOIL PARTICLES ARE LARGE. THE WATER AND NUTRIENTS (PARTICULARLY NITROGEN) QUICKLY DRAIN AWAY FROM THE PLANT ROOT ZONE. SANDY SOIL IS THE OPPOSITE OF CLAY SOIL.
• SILT SOIL IS MADE UP OF FINE PARTICLES. LIKE CLAY THE SOIL HOLDS WATER BUT DOESN’T HAVE GOOD AERATION AROUND THE ROOTS.
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IS THE LIFE LINKED TO THE SOILS? WHY?
YES, THE SOIL IS IMPORTANT FOR ALL THE LIVING ORGANISMS, BECAUSE THEY DEPENDS OF SOIL.
• IN A BALANCED SOIL, PLANTS GROW IN AN ACTIVE AND VIBRANT ENVIRONMENT.
• WITHOUT THE ACTIVITIES OF SOIL ORGANISMS, DEAD MATTER WOULD ACCUMULATE AND LITTER THE SOIL SURFACE, AND THERE WOULD BE NO FOOD FOR PLANTS.
• ALSO THE ANIMALS DEPEND OF SOIL BECAUSE THEY EAT THE PLANTS THAT GROW IN THE SOIL.
• THE HUMANS ALSO DEPEND OF THE SOIL BECAUSE WE NEED TO EAT THE VEGETABLES AND FRUITS THAT GROW IN THE SOIL.