Science project idea on the history of the production of soil in Northern United States.
History of Production of Soil of Northern US- Science Project Idea
How most of the soil of northern United States has been produced.In the northern part of the United States, pebbles and rocks of all sizes, unlike the solid rock bed of that region, are frequently found imbedded in the soil.Evidently the soil and rocks of those regions have not been carried there by water, since the rocks are scattered indiscriminately in the fine soil (clay).Explain the reason for this conclusion.On examination many of the rocks are found to have scratches on them.Also if the soil is removed, the surface of the country rock will be found to have deep parallel scratches and grooves. Many thousands of years ago, a great sheet of ice, called a glacier, covered the northern part of the United States.As it moved southward, its immense weight broke off fragments of rock which rubbed along the bottom of the glacier and ground up the rocky bed into a finely powdered soil (clay) leaving great scratches and grooves.The clay and the boulders, or rocks, became thoroughly mixed in the ice.As the glacier reached its southern extent, it melted and the material in it was deposited there as a series of ridges of hills called a terminal moraine. As the glacial period gradually passed, the glacier was unable to push farther south and as a result a series of these moraines have been formed.When the entire ice sheet melted, the rock and soil carried by it was left wherever it happened to be.As some parts of the glacier carried a large quantity of material and other parts only a small amount, a layer of rock and soil of unequal thickness was deposited over all the northern parts of the country.The depressions became filled with water and thus the large number of the lakes of these northern states is accounted for.
Science Project Idea Research your own countries history of soil production and present it via a report.
Related Items:
|
