What is the primary factor that explains migration?
A) climate
B) economic incentives
C) historical circumstances
D) stage of the life-cycle (retirement, etc.)
E) supply curves
B
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The outermost layer of a bone is comprised of
A) spongy bone. B) compact bone. C) yellow bone marrow. D) red bone marrow.
The sea is salty because
A) it contains salts from Earth's crust that have been dumped into the ocean and dissolved. B) marine organisms manufacture salts. C) rainwater is salty. D) the mantle is salty.
An example of a continental-continental convergent plate margin:a
Himalaya Mountains d. Marianas Trench b. Andes Mountains e. Atlantic Coast of North America c. East African Rift
Which of the following minerals is typically green and has no cleavage?
A. biotite B. olivine C. quartz D. plagioclase feldspar E. muscovite