Before the 1960s, how did geologists view the ocean basins and continents of the Earth?
a. Scientists believed that continents and ocean basins changed shape and location over time through the repeated erosion and deposition of sediments.
b. Scientists believed that all ocean basins and landmasses were permanently fixed in their positions.
c. Scientists believed that the formation of mountain chains and new ocean basins caused the movement of continents and oceanic sea floor.
d. Scientists believed that continents moved over time as a result of convection in the mantle.
e. Scientists believed that continents moved over time by plowing through oceanic crust.
b. Scientists believed that all ocean basins and landmasses were permanently fixed in their positions.
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The number of electrons ejected in the photoelectric effect depends on the
A. brightness of incident light. B. frequency and wavelength of light. C. wavelength of incident photons. D. frequency of incident photons.
Fertilizer use is least common in
A) Africa. B) the United States. C) Europe. D) Asia.
The stem is the part of seaweeds that connects the blade to the holdfast.
Answer the following statement true (T) or false (F)
Which of the following describes the distribution of the polar and nonpolar portions of lipids in the lipid bilayer?
A) Both polar heads are on the inside of the bilayer and both hydrophobic tails are on the outside of the bilayer. B) Both polar heads are on the outside of the bilayer and both hydrophobic tails are on the inside of the bilayer. C) Both the inside and outside of the bilayer consist of alternating polar heads and nonpolar tails. D) Some polar heads are on the inside of the bilayer and some are on the outside; the hydrophobic tails are similarly distributed.