Where Does Iron Come From?
Where Does Iron Come From? It is the most abundant element in the Earth. The Earth’s core is mostly made up of an iron-nickel alloy. It also makes up about 5% of...
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How Does a Tree Make Sap?
How Does a Tree Make Sap? Sap is the liquid that flows through trees and other plants and helps them live and grow. The roots of a tree draw from the soil a combination...
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Where Did the Expression Charley Horse Come From?
Where Did the Expression Charley Horse Come From? If you have ever exercised too much and developed a painful muscle strain in a leg or arm, then you are acquainted...
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What Is Cement Made From?
What Is Cement Made From? Cement is made from a mixture of lime, clay, silica, iron and aluminum minerals. Limestone is the most important source for the calcium, while...
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Are Weeds Completely Useless?
Are Weeds Completely Useless? A weed is any plant that is growing where we don’t want it to grow. For example, such weeds as dandelions and crab grass spoil the...
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