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1. The Earth comprises three principal layers: the dense, iron-rich core, the mantle made of silicate rocks that are semimolten at depth, and the thin, solid-surface crust.
The word "comprises" is closest in meaning to which of following?
(A) adapts to
(B) benefits from
(C) consists of
(D) focuses on
2. These plates move over the semimolten lower mantle to produce all of the major topographical features of the Earth. Active zones where intense deformation occurs are confined to the narrow, interconnecting boundaries of contact of the plates.
The word "intense" is closest in meaning to which of following?
(A) surface
(B) sudden
(C) rare
(D) extreme
3. New oceanic crust is formed along one or more margins of each plate by material issuing from deeper layers of the Earth’s crust, for example, by volcanic eruptions of lava at midocean ridges.
The word "margins" is closest in meaning to which of following?
(A) edges
(B) peaks
(C) interiors
(D) distances
4. If at such a spreading contact the two plates support continents, a rift is formed that will gradually widen and become flooded by the sea. The Atlantic Ocean formed like this as the American and Afro-European plates move in opposite directions.
The word "support" i...