What are two ways a primary magma can be generated?
What will be an ideal response?
Answer: Primary magmas can be generated through decompression melting at mid-ocean ridges or when water dehydrated from a subducting plate promotes partial melting.
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Who proposed first the Continental Drift Hypothesis?
a. Alfred Wagener b. Harry Hess c. James Hutton d. Charles Darwin
What are the problems encountered by using revenues as a proxy for output?
A) Revenues are distorted by changes in relative prices of service outputs. B) Many services produce both tangible and intangible outputs. C) Services produce only tangible outputs. D) There are no problems encountered. E) A and B only
On which continent is the intertropical convergence furthest from the equator in the summer season?
A) North America B) South America C) Europe D) Africa E) Asia
Ozone in the _____ is a pollutant but in the _____ is vital for life
a. stratosphere; troposphere b. troposphere; stratosphere c. troposphere; tropopause d. stratosphere; thermosphere