Instructions: categorize each reason listed below on the chart below.
list of reasons:
• ireland’s potato crop failed
• “poor law” taxed ireland’s small farmers.
• new factories in germany put people out of work.
• a freedom revolution in germany failed.
• few jobs existed for workers in china.
• people in some foreign nations were persecuted for their beliefs.
• people searched for adventure
• a rumor spread in germany that america would stop immigration.

The categories are political, social and economic reason for migration.

List of Reasons:

•Ireland’s potato crop failed  - economic.

•“Poor law” taxed Ireland’s small farmers. - political.

•New factories in Germany put people out of work - economic.

•A freedom revolution in Germany failed - political.

•Few jobs existed for workers in China - economic.

•People in some foreign nations were persecuted for their beliefs - political.

•People searched for adventure - social.

•A rumor spread in Germany that America would stop immigration - social.

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.

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)