________ are the down-dropped areas in the middle of spreading-center domes that are being pulled apart.
A. Horsts
B. Rift valleys
C. Escape basins
D. Gap holes
E. Junctions
Answer: B
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Higher social heterogeneity in urban settlements means that
A) the people you know socially are probably the same ones you see at work. B) the people are more alike than in rural settlements. C) people compete for limited space. D) there are many different kinds of people in cities. E) people play a specialized role in the urban economy.
Basaltic magma eruptions usually take which form?
a. ?lava flows b. ?pale ash flows c. ?lahar d. ?steam-rich explosions e. ?ash-rich explosions
The visible surface of Uranus and Neptune are bluish-green because they consist of
A. blue glacial ice. B. methane and other gases. C. oceans of liquid water. D. materials that are very cold because they are very far from the Sun.
The analysis of layered sedimentary deposits in the ocean is known as ____
A) stratigraphy B) oceanography C) marine biology D) ecology