Metamorphism takes place ____
A)as country rock is melted by contact with magma
B)while rocks remain solid
C)without high temperatures as long as rocks are buried at great depth
D)without high pressure, as long as high temperatures are present
E)only with fluid activity
B
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Mid-ocean ridges are a source of volcanic activity.
Answer the following statement true (T) or false (F)
_______, otherwise known as subtropical grassland, is found around Buenos Aires, Argentina
Fill in the blank(s) with correct word
The proposition that no two species can occupy the same ecological niche is known as
A) natural selection. B) symbiosis. C) ecological niche theory. D) competitive exclusion. E) trophic pyramid theory.
Cloud-to-ground lightning begins within the cloud when the localized electric potential gradient exceeds ____ volts per meter along a path perhaps 50 m long
a. 300 b. 3,000 c. 30,000 d. 300,000 e. 3 million