Which statement describes the process of subduction? A. Convection currents pull a plate into the mantle.
B. One plate slides beneath another due to gravitational pull.
C. Materials are transferred within Earth’s interior by density.
D. Heat cycles in the mantle cause plates to constantly move.

Which statement best describes the function of enzymes?

Which statement would indicate the presence of an acid

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.