1. PART A: Read the sentence from
paragraph 2: "Churning currents in the
molten rocks below propel them along
like a jumble of conveyor belts in
disrepair." How does this sentence
contribute to the reader's understanding
of the topic of the article?
A. by describing the geologic features.
that can form along each of the three
types of tectonic boundaries
B. by providing an analogy connecting
the concept of moving tectonic plates
to a concrete image
C. by signaling a shift in the structure of
the article to a chronological narrative
D. by connecting the introduction of the
article to the central idea that the
lithosphere is unique to planet Earth
