Read the following passage from a book that David Livingstone wrote about his travels in central Africa. “The country is becoming very beautiful, and furrowed [lined] by deep valleys; the underlying rocks, being igneous, have yielded [given] fertile soil. There is great abundance of large game [animals to hunt]. . . . We crossed the Mbai [River] and found in its bed rocks of pink marble. Some little hills near it are capped by marble of beautiful whiteness.”

Which best summarizes Livingstone’s description of Africa?

Africans are wealthy because they sell their marble.
Africa’s animals are evenly distributed throughout the continent.
There are abundant natural resources in Africa.
Most of Africa is made up of thriving cities.

q1: artillery

q2: simon bolivar

q3:   their workers and farmers demanded a return to spanish rule.

q4: drafted new constitutions

q5: oligarchies have replaced monarchies

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)