Near Earth's surface, ____ occupies about 78% and ____ about 21% of the total volume of dry air
A) nitrogen; oxygen
B) hydrogen; oxygen
C) oxygen; hydrogen
D) nitrogen; water vapor
A
You might also like to view...
The ____________ were great voyagers who colonized many thousands of islands in the Pacific. What will be an ideal response?
Which of the following fatty acids is(are) unsaturated?
A) arachidonic acid B) linoleic acid C) linolenic acid D) all of these
Where do the Himalayan Mountains lie, relative to the region of South Asia?
A) east of South Asia B) north of South Asia C) west of South Asia D) south of South Asia E) in the center of South Asia
Herbicides would be most useful in combating ________
A) weeds that infest our agricultural fields B) bacteria, such as Salmonella, which sometimes contaminate meat C) mosquitoes that spread malaria in tropical rain forests D) fungi that attack plant roots