The major discontinuity that occurs at a depth of 2,900 km below Earth's surface is the:a
low-velocity zone.
b. Moho.
c. inner core-outer core transition.
d. core-mantle boundary.
e. none of the above
D
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What mechanism accounts for differential survival and reproduction among members of a species?
a. neptunism b. stratigraphy c. formation d. natural selection e. orogeny
Deforestation can be slowed by which of the following?
A) building new roads and homes in forest areas B) recycling more paper to reduce the need for pulpwood C) growing more timber on short rotations D) practicing shifting agriculture on forest land E) practicing clear cutting
The Cascadia subduction zone is 1,100 kilometers long, and its characteristics of youthful oceanic plate and strong coupling with the overriding plate are similar to situations in southwestern Japan and southern Chile where very large earthquakes have occurred.
Answer the following statement true (T) or false (F)
What characteristics do humans share with r-selected species?
A) high reproductive output B) ability to survive well past the age of reproduction C) prolonged parental care D) rapid population growth that is largely unchecked E) considerable energy and resources spent providing for offspring