According to the theory of plate tectonics, where do activities such as earthquakes and volcanic eruptions occur? A
along plate boundaries

B
in the centers of plates

C
above the surfaces of plates

D
in the outer regions of plates

A or C Any one. If i am wrong let me know!

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.  

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.