- Silica and aluminum
- Silica and magnesium
- Sulfur and arsenic
- Sulfur and aluminum
- 120 dB (A)
- 130 dB (A)
- 140 dB (A)
- 115 dB (A)
- 90 dB (A)
- 85 dB (A)
Q) The sial layer is rich in ____________.
Solution:
(a) Silica and aluminum
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