GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sodium (Na)
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Oxygen (O)
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Carbon (C)
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Nitrogen (N)
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Detailed explanation-1: -Oxygen makes up a large part of the world we live in, both the ground and sky. Oxygen makes up 46% of the Earth’s crust, largely as silicates, compounds of oxygen and silicon. Oxygen also comprises around 21% of the atmosphere as molecular oxygen and ozone.
Detailed explanation-2: -On earth, oxygen is the most common element, making up about 47% of the earth’s mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth’s mass.
Detailed explanation-3: -1.) Hydrogen. Created during the hot Big Bang but depleted by stellar fusion, 70% of the Universe remains hydrogen. 2.) Helium. About 28% is helium, with 25% formed in the Big Bang and 3% from stellar fusion. 3.) Oxygen. 4.) Carbon. 5.) Neon. 6.) Nitrogen. 7.) Magnesium. 8.) Silicon. More items •25-May-2020