CSIR-NET
30. The relative abundance of elements, in decreasing order, in the Earth is
A) iron, oxygen, silicon, magnesium
B) oxygen, silicon, aluminium, iron
C) iron, magnesium, silicon, oxygen
D) oxygen, silicon, aluminium, magnesium
Answer: A
Explanation:
1. This is little bit confusing question.
2. There are two type of questions
a) abundance of elements in the Earth's crust?
b) abundance of elements in the Earth?
please study clearly the question.
a) abundance of elements in the Earth crust is-
Answer:
1. Oxygen (46.6%)
2. Silicon (27.7%)
3. Aluminum (8.1%)
4. Iron (5.0%)
5. Calcium (3.6%)
6. Sodium (2.8%)
7. Potassium (2.6%)
8. magnesium (2.1%)
Explanation:
1. This is little bit confusing question.
2. There are two type of questions
a) abundance of elements in the Earth's crust?
b) abundance of elements in the Earth?
please study clearly the question.
a) abundance of elements in the Earth crust is-
Answer:
1. Oxygen (46.6%)
2. Silicon (27.7%)
3. Aluminum (8.1%)
4. Iron (5.0%)
5. Calcium (3.6%)
6. Sodium (2.8%)
7. Potassium (2.6%)
8. magnesium (2.1%)
b) abundance of elements in the Earth?
Answer:
1. Iron
2. Oxygen
3. Silicon
4. Magnesium
Reference : https://www.sandatlas.org/composition-of-the-earths-crust/
right answer
ReplyDeleteA
ReplyDeleteCorrect Answer...
ReplyDeleteEarths major elements:
ReplyDelete1 Iron 32%
2 Oxygen 30%
3 Silicon 15%
4 Magnesium 13.9%
5 Sulfur 2.9%
6 Nickel 1.8%
7 Calcium 1.5%
8 Aluminium 1.4%, etc
Earths crust major elements:
ReplyDelete1 Oxygen 46%
2 Silicon 28%
3 Aluminum 8.2%
4 Iron 5.6%
5 Calcium 4.2%
6 Sodium 2.5%
7 Magnesium 2.5%
8 Potassium 2%
9 Titanium 0.6%, etc
Earths Mantle major elements:
ReplyDelete1 Oxygen 45%
2 Magnesium 23%
3 Silicon 22%
4 Iron 5.8%
5 Calcium 2.3%
6 Aluminium 2.2%
7 Sodium 0.3%
8 Potassium 0.3%, etc
Nice explanation nanajee..
ReplyDeleteEarths Core major elements:
ReplyDelete1 Iron 88.8%
2 Nickel 5.8%
3 Sulfur 4.5%