The most common minerals found in soils are combinations of which four elements, which are also the most common elements in Earth's crust?
a. carbon, hydrogen, oxygen, nitrogen
b. silicon, aluminum, oxygen, iron
c. potassium, zinc, copper, iodine
d. silicon, hydrogen, oxygen, nitrogen
e. carbon, aluminum, iron, potassium
b
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Deep scattering layers are best developed in regions with high surface productivity
a. True b. False
When a hypothesis has survived extensive scrutiny and when competing ones have been eliminated, a hypothesis may be elevated to the status of a(n) ________
Fill in the blank(s) with correct word
When considering the world population as a whole, birth rates and death rates enable one to calculate ________
A) the causes of infant mortality in a population B) the relative rates of immigration and emigration C) the causes of death in a population D) the proportions of fertile women in a population E) the increase or decrease in the population
The ________ Warm Period coincided with a time of increased solar radiation
Fill in the blank(s) with correct word