Which of the following statements is not a part of the theory of plate tectonics? A. Plates float on top of the Earth’s mantle. B. The Earth’s plates never move. C. Tectonic activity happens at plate boundaries. D. The Earth’s crust is composed of many plates.

B. The Earth's plates never move.

Explanation:

The theory of plate tectonics is a scientific theory that describes the separation of lands on the earth surface. It's built on the concept of continental drift which hypothesized that in the past the continents on the earth were once connected with one another before eventually  "drifted" across the ocean bed.

According to the theory of plate tectonics, the separation of the continents occurred because of the movements on the Earth's plates around 3.5 Billion years ago. So Option B is not part of the Theory of Plate tectonics

answer; i believe the correct answer is (117);