Plz ! which of the following statements is true?

a. one lithospheric plate can slide below another one at a convergent plate boundary.
b. lithospheric plates never come close to each other.
c. one lithospheric plate can slide below another one at any place.
d. a lithospheric place cannot slide below another one anywhere.

What type of reaction fuels the processes seen here?

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?

How does climate change cause the ocean's thermohaline current to slow down?