A student is researching the price of smartphones. She learns that her favorite brand of phone is designed in one
country but manufactured in another. After they're built, the
phones are shipped to markets in over 100 countries
around the world, which adds to their cost.
The student in the passage is primarily learning about which theme of
geography?
A. Location
B. Region
C. Movement
D. Human-environment interaction
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Answer after wwii, communist countries in eastern europe formed the warsaw pack, a military alliance, and comecon, an economic alliance;

1. d: oceanic crust is thicker and contains a lot of granite2.d: where two continental plates are colliding  3.b.contour boundaries4.b.plates that are attracted to each other by gravity5.a.as two continental plates collide along a convergent boundary, mountains are formed.

Aeolian processes,  pertain to  wind  activity in the study of  geology  and  weather  and specifically to the wind's ability to shape the surface of the  earth  (or other  planets). winds may  erode, transport, and deposit materials and are effective agents in regions with sparse  vegetation, a lack of soil moisture and a large supply of unconsolidated  sediments. although water is a much more powerful eroding force than wind, aeolian processes are important in arid environments such as  deserts