Question

part a: multiple choice (select the best answer) 1. what are tectonic plates? a) large pieces of the earths crust that float on the mantle b) layers of gas surrounding the earth c) rocks broken down by erosion d) frozen water masses on the continents

Explanation:

Tectonic plates are large, rigid slabs of the Earth's lithosphere (crust and upper - mantle) that move relative to one another. They 'float' on the more ductile asthenosphere within the mantle.

Answer:

A. Large pieces of the Earth's crust that float on the mantle