Which is one of four processes that produces different varieties of igneous rocks?
A) Single source rocks melt to form different types of magma.
B) Magma in a volcano changes mineral composition as soon as it is ejected.
C) Magma stays the same after assimilating nearby rocks.
D) Magma can change its composition by assimilating nearby rocks.
Answer: D
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What is the consensus about clean coal among environmental analysts?
A. Burning coal will always produce CO2 and mining it is harmful. B. It is already a reality in other countries like Mexico. C. It is possible with better technology that will remove CO2 and allow us to mine coal without any impact. D. If enough money is devoted to it, it could be reality in the U.S. in ten years.
Where do the Himalayan Mountains lie, relative to the region of South Asia?
A) north of South Asia
B) east of South Asia
C) in the center of South Asia
D) south of South Asia
E) west of South Asia
The Green Revolution began in which decade?
A) 1990s B) 1970s C) 1980s D) 1950s E) 1960s
If the string breaks as Nellie whirls a tin can in an overhead circle, the path of the can
A. is a straight line tangent to the circle. B. drops quickly to the ground. C. momentarily continues in a circle. D. is radially away from the center of the circular path.