Horizon A in a soil is ____
A)low in organic matter
B)the site of little biological activity
C)comprised entirely of sand and gravel
D)where the parent material of the soil is located
E)composed mostly of clays and stable minerals
E
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Based on your observations in question 7a, how important were volcanic eruptions in the overall temperature patterns of these cities over the last century?
The question is based on Figure 24-6, a chart showing average annual temperature from 1905 to 2015 in three U.S. cities: Nome, Alaska; Bozeman, Montana; and Tucson, Arizona. What will be an ideal response?
Why isn't the Precambrian more finely divided into subdivisions like periods and epochs?
A) Fewer and less diverse fossils exist in Precambrian rocks.
B) Precambrian rocks don't have radioactive isotopes in them.
C) Geologists just don't care about the Precambrian the way they do about more recent time periods.
D) The Precambrian lacks the igneous rocks that are most useful for radiometric dating.
99% of all air is contained in the troposphere and stratosphere.
Answer the following statement true (T) or false (F)
Detrital sedimentary rocks are typically classified on the basis of their ________
A) particle size B) provenance C) lithology D) texture