In our natural atmosphere,
A) there is very little hydrogen in any form.
B) hydrogen is most abundant combined with oxygen as water vapor and other compounds.
C) hydrogen is most abundant combined with carbon.
D) hydrogen gas is more abundant than carbon dioxide.
B
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The troposphere varies in depth with latitude
Indicate whether the statement is true or false
What is essential in the restoration and continuation of photosynthetic productivity in the ocean?
a. Upwelling b. Blooming c. Light d. Carbon dioxide
Earlier we discussed the concept of isostasy, where lower density rocks rise higher than higher density rocks. How is the variation of water depth at spreading centers (ridges) controlled by isostasy?
A) The lithosphere cools as it moves away from the ridge axis by sea floor spreading, and cooler rocks are lower density, so the sea floor gets deeper as the lithosphere gets more dense. B) Volcanic rocks are lighter than other rocks, and so the abundant volcanic rocks at the ridges are lower density features that produce the seafloor topography. C) It has nothing to do with isostasy; the areas are simply high because there are chains of active volcanos along the ridge crest, producing the topography. D) Oceanic ridges are sites where the lithosphere is carried into the mantle on one side (aka subduction zones), and the volcanos along these margins produce the ridge by buildup of lower density crust.
Some rivers in China are so toxic that they should not even be touched.
Answer the following statement true (T) or false (F)