What is the most likely cause of the mantle seismic velocity transition zones at 410 and 660 kilometers?
What will be an ideal response?
The most likely cause of the mantle seismic velocity transition zones at 410 and 660 km is high-pressure repacking of the crystal structures of olivine and pyroxene.
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Particulate pollution with diameters less than 2.5 µm are particularly dangerous because they ____
a. can penetrate deep into the lungs b. dissolve easily in water c. are chemically neutralized by carbon dioxide d. dissolve easily in water and they are chemically neutralized by dissolved carbon dioxide e. can cause eye irritation
Of the following regions or countries of South Asia, where would you be most likely to find a Muslim?
A) Bhutan
B) Sri Lanka
C) Kerala
D) Nepal
E) Kashmir
Exfoliation can be the result of unloading or ________
A) jointing B) glaciation C) sideways compression D) chemical weathering E) salt wedging
Strontium-90 is a radioactive isotope which is particularly hazardous. Which of the following statements is true about an atom of strontium-90?
A) It contains 52 neutrons. B) It contains 52 protons. C) It contains 90 neutrons. D) It contains 90 protons.