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Q. The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called
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Q. The items amenable to detection by soft x-rays are
Q. What happens when a drop of glycerol is added to crushed KMnO4 spread on a paper
Q. Besides hydrogen, which of the following elements is common in organic compounds?
Q. For extinguishing fire, we use
Q. The main source of Naphthalene is
Q. The atomic number of an element is equal to the
Q. Atomic number is the number equal to
Q. What particles move around the nucleus of an atom and are negatively charged?
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