Water vapor can be the ________ most abundant gas component of the Earth's atmosphere, with concentrations of up to ________.
A. tenth; 2 percent
B. second; 70 percent
C. third; 3 percent
D. fifth; 1 percent
Answer: C
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Which of the following does not describe ionic compounds?
A. They have a tendency to melt easily. B. They are usually very ordered. C. They are held together by electrostatic attraction. D. They consist of positive and negative ions. E. none of the above
Use the Five Themes of Geography – location, place, human-environment interaction, movement, and region – to describe your school building
What is the conclusion of careful studies regarding the relationship between environmental policies, on the one hand, and jobs and the economy, on the other?
What will be an ideal response?
__________ is the only African country in which Arabic is the official language.
a. Egypt b. Mauritania c. Morocco d. Tunisia e. Algeria