1. Aluminium
2. Calcium
3. Silicon
4. Oxygen
Select the answer using the code given below :
This question asks us to arrange four major elements found in the Earth's crust—Aluminium, Calcium, Silicon, and Oxygen—based on their weight percentage, from the smallest percentage to the largest (ascending order). Understanding the composition of the Earth's crust is key to solving this.
The Earth's crust is primarily composed of several elements. The abundance varies significantly among them. Here are the approximate weight percentages for the elements mentioned in the question:
| Element Name | Symbol | Approximate Weight Percentage (%) |
|---|---|---|
| Oxygen | O | 46.6 |
| Silicon | Si | 27.7 |
| Aluminium | Al | 8.1 |
| Calcium | Ca | 3.6 |
Now, let's arrange these elements based on their weight percentages in ascending order (from lowest to highest):
The question assigns numbers to these elements:
Translating the ascending order of elements (Calcium, Aluminium, Silicon, Oxygen) into their corresponding numbers gives us the sequence: 2, 1, 3, 4.
| List-I (Island/Nation) | List-II (Tectonic Plate) |
| A. Comoros | 1. North American Plate |
| B. Baffin Island | 2. African Plate |
| C. Sri Lanka | 3. Eurasian Plate |
| D. Andaman Islands | 4. Indo-Australian Plate |
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