Which is denser: a 100-million-year-old oceanic lithosphere near a convergent boundary, a 15-million-year-old oceanic lithosphere near a rift, or the upper part of the asthenosphere?
A) A 15-million-year-old oceanic lithosphere
B) 100-million-year-old oceanic lithosphere
C) Upper asthenosphere
D) They all have the same density.
Answer: B
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Biomass is a relatively recently discovered energy source.
Answer the following statement true (T) or false (F)
The chemical breakdown of plagioclase is an example of:
a. hydration b. solution c. hydrolysis d. all of the above
Which statement about family size is true? a. Wealthier people have more children
b. Couples with access to contraception have more children. c. City dwellers have more children than those in rural areas. d. Poorer people have fewer children. e. Better-educated people have fewer children.
What best describes why irregular shorelines evolve and become straighter over time?
A. waves erode headlands and deposit sediment in coves and bays B. plate tectonics causes uplift of the land, producing a more uniform coastline C. waves smooth out differences in the width of the beach D. forces that result from Earth spinning on its axis E. continuous sea level rise