The main way new oceanic crust is created is by
A) eruption of lavas and solidification of magmas at depth.
B) sediment scraped off a subducting slab.
C) continents that subside below sea level.
D) continental rifting, before the continents separate.
E) magmas along an ocean-continent convergent boundary.
A) eruption of lavas and solidification of magmas at depth.
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Since the Clean Air Act of 1970, emissions of most pollutants have fallen off substantially, with _____ showing the greatest reduction
a. ?sulfur dioxide b. ?methane c. ?lead d. ?carbon dioxide e. ?carbon monoxide
The distance between corresponding points on any two successive waves is known as the
A) Kelvin. B) wavelength. C) electromagnetic spectrum. D) frequency.
One of the end products of weathering rock is soil. What is another end product of weathering?
A) humus B) limestone C) well-sorted sediments D) dissolved atoms or molecules in ocean water
The majority of urban population growth in peripheral countries is due to natural increase
Indicate whether this statement is true or false.