Answer: b) earthquake activity
Options:
a) earth's density
b) earthquake activity
c) volcanic activity
d) atmospheric composition
Explanation:
Earthquake activity
: Seismic waves are responsible for the earth trembling during earthquakes. An earthquake occurs as seismic waves travel through the interior of Earth’s surface. A seismograph measures the characteristics of these waves such as how fast they travel as well as their strength.
By studying these attributes in different places, scientists come to understand the makeup of earth’s internal structure. The type of seismic waves most important to this study are body waves which travel through the earth’s interior
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A. Can help leaders decide how to plan for the future
Option B (Sudan)
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<span>Erosion by rivers is a main valley-forming
process; other processes, such as movement of the earth's crust and
glaciers, also have an important part in some cases. The rate at which a
river deepens its valley depends on several factors.</span>