What Is Fertilizer?
What Is Fertilizer? Plants need six basic nutrients to survive: carbon, hydrogen, oxygen, nitrogen, phosphorus, and potassium. The first three — carbon, hydrogen, and...
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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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What Caused the Tower of Pisa to Lean?
What Caused the Tower of Pisa to Lean? The famous Leaning Tower of Pisa in Italy is the campanile (bell tower) of the cathedral in Pisa. The tower tips so far to one...
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Why Does the Leaning Tower of Pisa Lean?
Why Does the Leaning Tower of Pisa Lean? The tower of Pisa is the bell tower of the cathedral of Pisa in Tuscany, Italy. The tower, which is one of the most unusual in...
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What Do We Mean by a Water Table?
Not far below the surface of the land there is a zone where the soil is saturated (filled) with water. The topmost level of this saturated zone is called the water...
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