So eager were american businessmen to get an enormous labor supply that they asked few questions about the effect of this "alien invasion" upon the old america inherited from the [founders]. they even stimulated the invasion artificially by importing huge armies of foreigners under contract to work in specified mines and mills. there seemed to be no limit to the factories, forges, refineries, and railways that could be built, to the multitudes that could be employed in conquering a continent.

which of the following best summarizes this biased paragraph objectively?
(a) us businessmen inflicted huge armies of foreigners on an unsuspecting america.
(b) the hordes of unskilled laborers brought in by mine and mill owners became an “alien invasion,” which i believe threatened america’s future.
(c) one way in which us businessmen acquired workers for their mines and mills was by offering contracts to groups of immigrants.
(d) if they could make more money or build more railroads, us businessmen didn’t care what happened to the america of our founders.

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)

answer; dr.black,who allows only certain individuals to mate;

answerscientific inquiry;