How Will You Describe Quartz?
Quartz, the commonest of all minerals, is made of silica. It is found in most kinds of rocks in colorless, often transparent form. There…
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Sandstone
What Is Shale?
Shale is a fine-grained, earthy, sedimentary rock rather like clay, but, unlike clay, it is formed in thin layers. It is usually harder than…
How Did the White House Get Its Name?
How Did the White House Get Its Name? The home of the president of the United States gets its name from its white walls. But the White House